diff --git a/libraries/src/Event/CoreEventAware.php b/libraries/src/Event/CoreEventAware.php
index b3507b111bf44..ce55048350968 100644
--- a/libraries/src/Event/CoreEventAware.php
+++ b/libraries/src/Event/CoreEventAware.php
@@ -90,6 +90,8 @@ trait CoreEventAware
         'onSchemaPrepareData'       => Plugin\System\Schemaorg\PrepareDataEvent::class,
         'onSchemaPrepareForm'       => Plugin\System\Schemaorg\PrepareFormEvent::class,
         'onSchemaPrepareSave'       => Plugin\System\Schemaorg\PrepareSaveEvent::class,
+        // Plugin: Stats
+        'onGetStatsData' => Plugin\System\Stats\GetStatsDataEvent::class,
         // Content
         'onContentPrepare'       => Content\ContentPrepareEvent::class,
         'onContentAfterTitle'    => Content\AfterTitleEvent::class,
diff --git a/libraries/src/Event/Plugin/System/Stats/GetStatsDataEvent.php b/libraries/src/Event/Plugin/System/Stats/GetStatsDataEvent.php
new file mode 100644
index 0000000000000..1b897777dc332
--- /dev/null
+++ b/libraries/src/Event/Plugin/System/Stats/GetStatsDataEvent.php
@@ -0,0 +1,94 @@
+<?php
+
+/**
+ * Joomla! Content Management System
+ *
+ * @copyright  (C) 2023 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license    GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+namespace Joomla\CMS\Event\Plugin\System\Stats;
+
+use Joomla\CMS\Event\AbstractImmutableEvent;
+use Joomla\CMS\Event\ReshapeArgumentsAware;
+use Joomla\CMS\Event\Result\ResultAware;
+use Joomla\CMS\Event\Result\ResultAwareInterface;
+use Joomla\CMS\Event\Result\ResultTypeArrayAware;
+
+// phpcs:disable PSR1.Files.SideEffects
+\defined('_JEXEC') or die;
+// phpcs:enable PSR1.Files.SideEffects
+
+/**
+ * Class for Stats plugin.
+ * Example:
+ *   new GetStatsDataEvent('onEventName', ['context' => 'com_example.example']);
+ *
+ * @since  __DEPLOY_VERSION__
+ */
+class GetStatsDataEvent extends AbstractImmutableEvent implements ResultAwareInterface
+{
+    use ReshapeArgumentsAware;
+    use ResultAware;
+    use ResultTypeArrayAware;
+
+    /**
+     * The argument names, in order expected by legacy plugins.
+     *
+     * @var array
+     *
+     * @since  __DEPLOY_VERSION__
+     * @deprecated __DEPLOY_VERSION__ will be removed in 6.0
+     */
+    protected $legacyArgumentsOrder = ['context'];
+
+    /**
+     * Constructor.
+     *
+     * @param   string  $name       The event name.
+     * @param   array   $arguments  The event arguments.
+     *
+     * @throws  \BadMethodCallException
+     *
+     * @since   __DEPLOY_VERSION__
+     */
+    public function __construct($name, array $arguments = [])
+    {
+        // Reshape the arguments array to preserve b/c with legacy listeners
+        if ($this->legacyArgumentsOrder) {
+            $arguments = $this->reshapeArguments($arguments, $this->legacyArgumentsOrder);
+        }
+
+        parent::__construct($name, $arguments);
+
+        if (!\array_key_exists('context', $this->arguments)) {
+            throw new \BadMethodCallException("Argument 'context' of event {$name} is required but has not been provided");
+        }
+    }
+
+    /**
+     * Setter for the context argument.
+     *
+     * @param   string  $value  The value to set
+     *
+     * @return  string
+     *
+     * @since  __DEPLOY_VERSION__
+     */
+    protected function onSetContext(string $value): string
+    {
+        return $value;
+    }
+
+    /**
+     * Getter for the context argument.
+     *
+     * @return  string
+     *
+     * @since  __DEPLOY_VERSION__
+     */
+    public function getContext(): string
+    {
+        return $this->arguments['context'];
+    }
+}
diff --git a/plugins/system/accessibility/src/Extension/Accessibility.php b/plugins/system/accessibility/src/Extension/Accessibility.php
index e951c9166a97b..7b3b2f6e4c377 100644
--- a/plugins/system/accessibility/src/Extension/Accessibility.php
+++ b/plugins/system/accessibility/src/Extension/Accessibility.php
@@ -10,7 +10,9 @@
 
 namespace Joomla\Plugin\System\Accessibility\Extension;
 
+use Joomla\CMS\Event\Application\BeforeCompileHeadEvent;
 use Joomla\CMS\Plugin\CMSPlugin;
+use Joomla\Event\SubscriberInterface;
 
 // phpcs:disable PSR1.Files.SideEffects
 \defined('_JEXEC') or die;
@@ -21,32 +23,49 @@
  *
  * @since  4.0.0
  */
-final class Accessibility extends CMSPlugin
+final class Accessibility extends CMSPlugin implements SubscriberInterface
 {
+    /**
+     * Returns an array of events this subscriber will listen to.
+     *
+     * @return array
+     *
+     * @since   __DEPLOY_VERSION__
+     */
+    public static function getSubscribedEvents(): array
+    {
+        return [
+            'onBeforeCompileHead' => 'onBeforeCompileHead',
+        ];
+    }
+
     /**
      * Add the javascript for the accessibility menu
      *
+     * @param  BeforeCompileHeadEvent $event  The event object
+     *
      * @return  void
      *
      * @since   4.0.0
      */
-    public function onBeforeCompileHead()
+    public function onBeforeCompileHead(BeforeCompileHeadEvent $event): void
     {
         $section = $this->params->get('section', 'administrator');
+        $app     = $event->getApplication();
 
-        if ($section !== 'both' && $this->getApplication()->isClient($section) !== true) {
+        if ($section !== 'both' && $app->isClient($section) !== true) {
             return;
         }
 
         // Get the document object.
-        $document = $this->getApplication()->getDocument();
+        $document = $event->getDocument();
 
         if ($document->getType() !== 'html') {
             return;
         }
 
         // Are we in a modal?
-        if ($this->getApplication()->getInput()->get('tmpl', '', 'cmd') === 'component') {
+        if ($app->getInput()->get('tmpl', '', 'cmd') === 'component') {
             return;
         }
 
@@ -54,10 +73,10 @@ public function onBeforeCompileHead()
         $this->loadLanguage();
 
         // Determine if it is an LTR or RTL language
-        $direction = $this->getApplication()->getLanguage()->isRtl() ? 'right' : 'left';
+        $direction = $app->getLanguage()->isRtl() ? 'right' : 'left';
 
         // Detect the current active language
-        $lang = $this->getApplication()->getLanguage()->getTag();
+        $lang = $app->getLanguage()->getTag();
 
         /**
         * Add strings for translations in Javascript.
@@ -67,20 +86,20 @@ public function onBeforeCompileHead()
             'accessibility-options',
             [
                 'labels' => [
-                    'menuTitle'           => $this->getApplication()->getLanguage()->_('PLG_SYSTEM_ACCESSIBILITY_MENU_TITLE'),
-                    'increaseText'        => $this->getApplication()->getLanguage()->_('PLG_SYSTEM_ACCESSIBILITY_INCREASE_TEXT'),
-                    'decreaseText'        => $this->getApplication()->getLanguage()->_('PLG_SYSTEM_ACCESSIBILITY_DECREASE_TEXT'),
-                    'increaseTextSpacing' => $this->getApplication()->getLanguage()->_('PLG_SYSTEM_ACCESSIBILITY_INCREASE_SPACING'),
-                    'decreaseTextSpacing' => $this->getApplication()->getLanguage()->_('PLG_SYSTEM_ACCESSIBILITY_DECREASE_SPACING'),
-                    'invertColors'        => $this->getApplication()->getLanguage()->_('PLG_SYSTEM_ACCESSIBILITY_INVERT_COLORS'),
-                    'grayHues'            => $this->getApplication()->getLanguage()->_('PLG_SYSTEM_ACCESSIBILITY_GREY'),
-                    'underlineLinks'      => $this->getApplication()->getLanguage()->_('PLG_SYSTEM_ACCESSIBILITY_UNDERLINE'),
-                    'bigCursor'           => $this->getApplication()->getLanguage()->_('PLG_SYSTEM_ACCESSIBILITY_CURSOR'),
-                    'readingGuide'        => $this->getApplication()->getLanguage()->_('PLG_SYSTEM_ACCESSIBILITY_READING'),
-                    'textToSpeech'        => $this->getApplication()->getLanguage()->_('PLG_SYSTEM_ACCESSIBILITY_TTS'),
-                    'speechToText'        => $this->getApplication()->getLanguage()->_('PLG_SYSTEM_ACCESSIBILITY_STT'),
-                    'resetTitle'          => $this->getApplication()->getLanguage()->_('PLG_SYSTEM_ACCESSIBILITY_RESET'),
-                    'closeTitle'          => $this->getApplication()->getLanguage()->_('PLG_SYSTEM_ACCESSIBILITY_CLOSE'),
+                    'menuTitle'           => $app->getLanguage()->_('PLG_SYSTEM_ACCESSIBILITY_MENU_TITLE'),
+                    'increaseText'        => $app->getLanguage()->_('PLG_SYSTEM_ACCESSIBILITY_INCREASE_TEXT'),
+                    'decreaseText'        => $app->getLanguage()->_('PLG_SYSTEM_ACCESSIBILITY_DECREASE_TEXT'),
+                    'increaseTextSpacing' => $app->getLanguage()->_('PLG_SYSTEM_ACCESSIBILITY_INCREASE_SPACING'),
+                    'decreaseTextSpacing' => $app->getLanguage()->_('PLG_SYSTEM_ACCESSIBILITY_DECREASE_SPACING'),
+                    'invertColors'        => $app->getLanguage()->_('PLG_SYSTEM_ACCESSIBILITY_INVERT_COLORS'),
+                    'grayHues'            => $app->getLanguage()->_('PLG_SYSTEM_ACCESSIBILITY_GREY'),
+                    'underlineLinks'      => $app->getLanguage()->_('PLG_SYSTEM_ACCESSIBILITY_UNDERLINE'),
+                    'bigCursor'           => $app->getLanguage()->_('PLG_SYSTEM_ACCESSIBILITY_CURSOR'),
+                    'readingGuide'        => $app->getLanguage()->_('PLG_SYSTEM_ACCESSIBILITY_READING'),
+                    'textToSpeech'        => $app->getLanguage()->_('PLG_SYSTEM_ACCESSIBILITY_TTS'),
+                    'speechToText'        => $app->getLanguage()->_('PLG_SYSTEM_ACCESSIBILITY_STT'),
+                    'resetTitle'          => $app->getLanguage()->_('PLG_SYSTEM_ACCESSIBILITY_RESET'),
+                    'closeTitle'          => $app->getLanguage()->_('PLG_SYSTEM_ACCESSIBILITY_CLOSE'),
                 ],
                 'icon' => [
                     'position' => [
diff --git a/plugins/system/actionlogs/src/Extension/ActionLogs.php b/plugins/system/actionlogs/src/Extension/ActionLogs.php
index 5f4129451519a..2b1e9f1bd0999 100644
--- a/plugins/system/actionlogs/src/Extension/ActionLogs.php
+++ b/plugins/system/actionlogs/src/Extension/ActionLogs.php
@@ -11,6 +11,9 @@
 namespace Joomla\Plugin\System\ActionLogs\Extension;
 
 use Joomla\CMS\Component\ComponentHelper;
+use Joomla\CMS\Event\Application\AfterInitialiseEvent;
+use Joomla\CMS\Event\Model;
+use Joomla\CMS\Event\User;
 use Joomla\CMS\Form\Form;
 use Joomla\CMS\HTML\HTMLHelper;
 use Joomla\CMS\Language\Text;
@@ -21,7 +24,8 @@
 use Joomla\Database\DatabaseAwareTrait;
 use Joomla\Database\Exception\ExecutionFailureException;
 use Joomla\Database\ParameterType;
-use Joomla\Event\DispatcherInterface;
+use Joomla\Event\Priority;
+use Joomla\Event\SubscriberInterface;
 
 // phpcs:disable PSR1.Files.SideEffects
 \defined('_JEXEC') or die;
@@ -32,41 +36,60 @@
  *
  * @since  3.9.0
  */
-final class ActionLogs extends CMSPlugin
+final class ActionLogs extends CMSPlugin implements SubscriberInterface
 {
     use DatabaseAwareTrait;
     use UserFactoryAwareTrait;
 
     /**
-     * Constructor.
+     * Returns an array of events this subscriber will listen to.
      *
-     * @param   DispatcherInterface  $dispatcher   The dispatcher
-     * @param   array                $config       An optional associative array of configuration settings
+     * @return array
      *
-     * @since   3.9.0
+     * @since   __DEPLOY_VERSION__
      */
-    public function __construct(DispatcherInterface $dispatcher, array $config)
+    public static function getSubscribedEvents(): array
     {
-        parent::__construct($dispatcher, $config);
+        return [
+            'onAfterInitialise'    => ['onAfterInitialise', Priority::ABOVE_NORMAL],
+            'onContentPrepareForm' => 'onContentPrepareForm',
+            'onContentPrepareData' => 'onContentPrepareData',
+            'onUserAfterSave'      => 'onUserAfterSave',
+            'onUserAfterDelete'    => 'onUserAfterDelete',
+            'onExtensionAfterSave' => 'onExtensionAfterSave',
+        ];
+    }
 
+    /**
+     * After initialise listener.
+     *
+     * @param   AfterInitialiseEvent $event  The event instance.
+     *
+     * @return  void
+     *
+     * @since   __DEPLOY_VERSION__
+     */
+    public function onAfterInitialise(AfterInitialiseEvent $event): void
+    {
         // Import actionlog plugin group so that these plugins will be triggered for events
-        PluginHelper::importPlugin('actionlog');
+        PluginHelper::importPlugin('actionlog', null, true, $event->getApplication()->getDispatcher());
     }
 
     /**
      * Adds additional fields to the user editing form for logs e-mail notifications
      *
-     * @param   Form   $form  The form to be altered.
-     * @param   mixed  $data  The associated data for the form.
+     * @param   Model\PrepareFormEvent $event  The event instance.
      *
-     * @return  boolean
+     * @return  void
      *
      * @since   3.9.0
      *
      * @throws  \Exception
      */
-    public function onContentPrepareForm(Form $form, $data)
+    public function onContentPrepareForm(Model\PrepareFormEvent $event): void
     {
+        $form     = $event->getForm();
+        $data     = $event->getData();
         $formName = $form->getName();
 
         $allowedFormNames = [
@@ -75,7 +98,7 @@ public function onContentPrepareForm(Form $form, $data)
         ];
 
         if (!\in_array($formName, $allowedFormNames, true)) {
-            return true;
+            return;
         }
 
         /**
@@ -85,7 +108,7 @@ public function onContentPrepareForm(Form $form, $data)
         $user = $this->getApplication()->getIdentity();
 
         if (!$user || !$user->authorise('core.admin')) {
-            return true;
+            return;
         }
 
         // Load plugin language files.
@@ -103,7 +126,7 @@ public function onContentPrepareForm(Form $form, $data)
         }
 
         if (empty($data->id) || !$this->getUserFactory()->loadUserById($data->id)->authorise('core.admin')) {
-            return true;
+            return;
         }
 
         Form::addFormPath(JPATH_PLUGINS . '/' . $this->_type . '/' . $this->_name . '/forms');
@@ -111,40 +134,41 @@ public function onContentPrepareForm(Form $form, $data)
         if ((!PluginHelper::isEnabled('actionlog', 'joomla')) && ($this->getApplication()->isClient('administrator'))) {
             $form->loadFile('information', false);
 
-            return true;
+            return;
         }
 
         if (!PluginHelper::isEnabled('actionlog', 'joomla')) {
-            return true;
+            return;
         }
 
         $form->loadFile('actionlogs', false);
-
-        return true;
     }
 
     /**
      * Runs on content preparation
      *
-     * @param   string  $context  The context for the data
-     * @param   object  $data     An object containing the data for the form.
+     * @param   Model\PrepareDataEvent $event  The event instance.
      *
-     * @return  boolean
+     * @return  void
      *
      * @since   3.9.0
      */
-    public function onContentPrepareData($context, $data)
+    public function onContentPrepareData(Model\PrepareDataEvent $event): void
     {
+        $context = $event->getContext();
+
         if (!\in_array($context, ['com_users.profile', 'com_users.user'])) {
-            return true;
+            return;
         }
 
+        $data = $event->getData();
+
         if (\is_array($data)) {
             $data = (object) $data;
         }
 
         if (empty($data->id) || !$this->getUserFactory()->loadUserById($data->id)->authorise('core.admin')) {
-            return true;
+            return;
         }
 
         $db = $this->getDatabase();
@@ -159,11 +183,11 @@ public function onContentPrepareData($context, $data)
         try {
             $values = $db->setQuery($query)->loadObject();
         } catch (ExecutionFailureException $e) {
-            return false;
+            return;
         }
 
         if (!$values) {
-            return true;
+            return;
         }
 
         // Load plugin language files.
@@ -185,28 +209,25 @@ public function onContentPrepareData($context, $data)
         if (!HTMLHelper::isRegistered('users.actionlogsExcludeSelf')) {
             HTMLHelper::register('users.actionlogsExcludeSelf', [__CLASS__, 'renderActionlogsExcludeSelf']);
         }
-
-        return true;
     }
 
     /**
      * Utility method to act on a user after it has been saved.
      *
-     * @param   array    $user     Holds the new user data.
-     * @param   boolean  $isNew    True if a new user is stored.
-     * @param   boolean  $success  True if user was successfully stored in the database.
-     * @param   string   $msg      Message.
+     * @param   User\AfterSaveEvent $event  The event instance.
      *
      * @return  void
      *
      * @since   3.9.0
      */
-    public function onUserAfterSave($user, $isNew, $success, $msg): void
+    public function onUserAfterSave(User\AfterSaveEvent $event): void
     {
-        if (!$success) {
+        if (!$event->getSavingResult()) {
             return;
         }
 
+        $user = $event->getUser();
+
         // Clear access rights in case user groups were changed.
         $userObject = $this->getUserFactory()->loadUserById($user['id']);
         $userObject->clearAccessRights();
@@ -292,20 +313,19 @@ public function onUserAfterSave($user, $isNew, $success, $msg): void
      *
      * Method is called after user data is deleted from the database
      *
-     * @param   array    $user     Holds the user data
-     * @param   boolean  $success  True if user was successfully stored in the database
-     * @param   string   $msg      Message
+     * @param   User\AfterDeleteEvent $event  The event instance.
      *
      * @return  void
      *
      * @since   3.9.0
      */
-    public function onUserAfterDelete($user, $success, $msg): void
+    public function onUserAfterDelete(User\AfterDeleteEvent $event): void
     {
-        if (!$success) {
+        if (!$event->getDeletingResult()) {
             return;
         }
 
+        $user   = $event->getUser();
         $db     = $this->getDatabase();
         $userid = (int) $user['id'];
 
@@ -375,19 +395,20 @@ public static function renderActionlogsExtensions($extensions)
     }
 
     /**
-     * On Saving extensions logging method
+     * On Saving extensions logging method.
      * Method is called when an extension is being saved
      *
-     * @param   string                   $context  The extension
-     * @param   \Joomla\CMS\Table\Table  $table    DataBase Table object
-     * @param   boolean                  $isNew    If the extension is new or not
+     * @param   Model\AfterSaveEvent $event  The event instance.
      *
      * @return  void
      *
      * @since   5.1.0
      */
-    public function onExtensionAfterSave($context, $table, $isNew): void
+    public function onExtensionAfterSave(Model\AfterSaveEvent $event): void
     {
+        $context = $event->getContext();
+        $table   = $event->getItem();
+
         if ($context !== 'com_config.component' || $table->name !== 'com_actionlogs') {
             return;
         }
diff --git a/plugins/system/fields/src/Extension/Fields.php b/plugins/system/fields/src/Extension/Fields.php
index d8d31434f4e5b..8926dc06b9b15 100644
--- a/plugins/system/fields/src/Extension/Fields.php
+++ b/plugins/system/fields/src/Extension/Fields.php
@@ -12,10 +12,12 @@
 
 use Joomla\CMS\Event\Content;
 use Joomla\CMS\Event\Model;
+use Joomla\CMS\Event\User;
 use Joomla\CMS\Language\Multilanguage;
 use Joomla\CMS\Plugin\CMSPlugin;
 use Joomla\CMS\User\UserFactoryAwareTrait;
 use Joomla\Component\Fields\Administrator\Helper\FieldsHelper;
+use Joomla\Event\SubscriberInterface;
 use Joomla\Registry\Registry;
 
 // phpcs:disable PSR1.Files.SideEffects
@@ -27,10 +29,33 @@
  *
  * @since  3.7
  */
-final class Fields extends CMSPlugin
+final class Fields extends CMSPlugin implements SubscriberInterface
 {
     use UserFactoryAwareTrait;
 
+    /**
+     * Returns an array of events this subscriber will listen to.
+     *
+     * @return array
+     *
+     * @since   __DEPLOY_VERSION__
+     */
+    public static function getSubscribedEvents(): array
+    {
+        return [
+            'onContentNormaliseRequestData' => 'onContentNormaliseRequestData',
+            'onContentPrepare'              => 'onContentPrepare',
+            'onContentPrepareForm'          => 'onContentPrepareForm',
+            'onContentAfterSave'            => 'onContentAfterSave',
+            'onContentAfterDelete'          => 'onContentAfterDelete',
+            'onUserAfterSave'               => 'onUserAfterSave',
+            'onUserAfterDelete'             => 'onUserAfterDelete',
+            'onContentAfterTitle'           => 'onContentAfterTitle',
+            'onContentBeforeDisplay'        => 'onContentBeforeDisplay',
+            'onContentAfterDisplay'         => 'onContentAfterDisplay',
+        ];
+    }
+
     /**
      * Normalizes the request data.
      *
@@ -80,17 +105,18 @@ public function onContentNormaliseRequestData(Model\NormaliseRequestDataEvent $e
     /**
      * The save event.
      *
-     * @param   string                   $context  The context
-     * @param   \Joomla\CMS\Table\Table  $item     The table
-     * @param   boolean                  $isNew    Is new item
-     * @param   array                    $data     The validated data
+     * @param   Model\AfterSaveEvent  $event  The event object
      *
      * @return  void
      *
      * @since   3.7.0
      */
-    public function onContentAfterSave($context, $item, $isNew, $data = []): void
+    public function onContentAfterSave(Model\AfterSaveEvent $event): void
     {
+        $context = $event->getContext();
+        $item    = $event->getItem();
+        $data    = $event->getData();
+
         // Check if data is an array and the item has an id
         if (!\is_array($data) || empty($item->id) || empty($data['com_fields'])) {
             return;
@@ -155,17 +181,17 @@ public function onContentAfterSave($context, $item, $isNew, $data = []): void
     /**
      * The save event.
      *
-     * @param   array    $userData  The date
-     * @param   boolean  $isNew     Is new
-     * @param   boolean  $success   Is success
-     * @param   string   $msg       The message
+     * @param   User\AfterSaveEvent  $event  The event object
      *
      * @return  void
      *
      * @since   3.7.0
      */
-    public function onUserAfterSave($userData, $isNew, $success, $msg): void
+    public function onUserAfterSave(User\AfterSaveEvent $event): void
     {
+        $userData = $event->getUser();
+        $success  = $event->getSavingResult();
+
         // It is not possible to manipulate the user during save events
         // Check if data is valid or we are in a recursion
         if (!$userData['id'] || !$success) {
@@ -182,21 +208,29 @@ public function onUserAfterSave($userData, $isNew, $success, $msg): void
         }
 
         // Trigger the events with a real user
-        $this->onContentAfterSave('com_users.user', $user, false, $userData);
+        $contentEvent = new Model\AfterSaveEvent('onContentAfterSave', [
+            'context' => 'com_users.user',
+            'subject' => $user,
+            'isNew'   => false,
+            'data'    => $userData,
+        ]);
+        $this->onContentAfterSave($contentEvent);
     }
 
     /**
      * The delete event.
      *
-     * @param   string    $context  The context
-     * @param   \stdClass  $item     The item
+     * @param   Model\AfterDeleteEvent  $event  The event object
      *
      * @return  void
      *
      * @since   3.7.0
      */
-    public function onContentAfterDelete($context, $item): void
+    public function onContentAfterDelete(Model\AfterDeleteEvent $event): void
     {
+        $context = $event->getContext();
+        $item    = $event->getItem();
+
         // Set correct context for category
         if ($context === 'com_categories.category') {
             $context = $item->extension . '.categories';
@@ -219,20 +253,23 @@ public function onContentAfterDelete($context, $item): void
     /**
      * The user delete event.
      *
-     * @param   array     $user    The context
-     * @param   boolean   $success Is success
-     * @param   string    $msg     The message
+     * @param   User\AfterDeleteEvent  $event  The event object
      *
      * @return  void
      *
      * @since   3.7.0
      */
-    public function onUserAfterDelete($user, $success, $msg): void
+    public function onUserAfterDelete(User\AfterDeleteEvent $event): void
     {
+        $user     = $event->getUser();
         $item     = new \stdClass();
         $item->id = $user['id'];
 
-        $this->onContentAfterDelete('com_users.user', $item);
+        $contentEvent = new Model\AfterDeleteEvent('onContentAfterDelete', [
+            'context' => 'com_users.user',
+            'subject' => $item,
+        ]);
+        $this->onContentAfterDelete($contentEvent);
     }
 
     /**
diff --git a/plugins/system/highlight/services/provider.php b/plugins/system/highlight/services/provider.php
index a13d7073782ac..ac91d9227ee46 100644
--- a/plugins/system/highlight/services/provider.php
+++ b/plugins/system/highlight/services/provider.php
@@ -11,7 +11,6 @@
 \defined('_JEXEC') or die;
 
 use Joomla\CMS\Extension\PluginInterface;
-use Joomla\CMS\Factory;
 use Joomla\CMS\Plugin\PluginHelper;
 use Joomla\DI\Container;
 use Joomla\DI\ServiceProviderInterface;
@@ -37,7 +36,6 @@ function (Container $container) {
                     $container->get(DispatcherInterface::class),
                     (array) PluginHelper::getPlugin('system', 'highlight')
                 );
-                $plugin->setApplication(Factory::getApplication());
 
                 return $plugin;
             }
diff --git a/plugins/system/highlight/src/Extension/Highlight.php b/plugins/system/highlight/src/Extension/Highlight.php
index 52fcb230d6599..4b515d55e7400 100644
--- a/plugins/system/highlight/src/Extension/Highlight.php
+++ b/plugins/system/highlight/src/Extension/Highlight.php
@@ -11,10 +11,12 @@
 namespace Joomla\Plugin\System\Highlight\Extension;
 
 use Joomla\CMS\Component\ComponentHelper;
+use Joomla\CMS\Event\Application\AfterDispatchEvent;
+use Joomla\CMS\Event\Finder\ResultEvent;
 use Joomla\CMS\Filter\InputFilter;
 use Joomla\CMS\Plugin\CMSPlugin;
 use Joomla\CMS\Uri\Uri;
-use Joomla\Component\Finder\Administrator\Indexer\Result;
+use Joomla\Event\SubscriberInterface;
 
 // phpcs:disable PSR1.Files.SideEffects
 \defined('_JEXEC') or die;
@@ -25,8 +27,23 @@
  *
  * @since  2.5
  */
-final class Highlight extends CMSPlugin
+final class Highlight extends CMSPlugin implements SubscriberInterface
 {
+    /**
+     * Returns an array of events this subscriber will listen to.
+     *
+     * @return array
+     *
+     * @since   __DEPLOY_VERSION__
+     */
+    public static function getSubscribedEvents(): array
+    {
+        return [
+            'onAfterDispatch' => 'onAfterDispatch',
+            'onFinderResult'  => 'onFinderResult',
+        ];
+    }
+
     /**
      * Method to catch the onAfterDispatch event.
      *
@@ -34,19 +51,21 @@ final class Highlight extends CMSPlugin
      * The highlighting is done with JavaScript so we just
      * need to check a few parameters and the JHtml behavior will do the rest.
      *
+     * @param  AfterDispatchEvent $event  The event object
+     *
      * @return  void
      *
      * @since   2.5
      */
-    public function onAfterDispatch()
+    public function onAfterDispatch(AfterDispatchEvent $event): void
     {
         // Check that we are in the site application.
-        if (!$this->getApplication()->isClient('site')) {
+        if (!$event->getApplication()->isClient('site')) {
             return;
         }
 
         // Set the variables.
-        $input     = $this->getApplication()->getInput();
+        $input     = $event->getApplication()->getInput();
         $extension = $input->get('option', '', 'cmd');
 
         // Check if the highlighter is enabled.
@@ -55,7 +74,7 @@ public function onAfterDispatch()
         }
 
         // Check if the highlighter should be activated in this environment.
-        if ($input->get('tmpl', '', 'cmd') === 'component' || $this->getApplication()->getDocument()->getType() !== 'html') {
+        if ($input->get('tmpl', '', 'cmd') === 'component' || $event->getApplication()->getDocument()->getType() !== 'html') {
             return;
         }
 
@@ -78,7 +97,7 @@ public function onAfterDispatch()
         }
 
         /** @var \Joomla\CMS\Document\HtmlDocument $doc */
-        $doc = $this->getApplication()->getDocument();
+        $doc = $event->getApplication()->getDocument();
 
         // Activate the highlighter.
         if (!empty($cleanTerms)) {
@@ -101,14 +120,13 @@ public function onAfterDispatch()
     /**
      * Method to catch the onFinderResult event.
      *
-     * @param   Result  $item   The search result
-     * @param   object  $query  The search query of this result
+     * @param  ResultEvent $event  The event object
      *
      * @return  void
      *
      * @since   4.0.0
      */
-    public function onFinderResult($item, $query)
+    public function onFinderResult(ResultEvent $event): void
     {
         static $params;
 
@@ -116,6 +134,9 @@ public function onFinderResult($item, $query)
             $params = ComponentHelper::getParams('com_finder');
         }
 
+        $item  = $event->getItem();
+        $query = $event->getQuery();
+
         // Get the route with highlighting information.
         if (
             !empty($query->highlight)
diff --git a/plugins/system/jooa11y/src/Extension/Jooa11y.php b/plugins/system/jooa11y/src/Extension/Jooa11y.php
index 86ba87ec91ae8..ae6a969850ff3 100644
--- a/plugins/system/jooa11y/src/Extension/Jooa11y.php
+++ b/plugins/system/jooa11y/src/Extension/Jooa11y.php
@@ -10,6 +10,8 @@
 
 namespace Joomla\Plugin\System\Jooa11y\Extension;
 
+use Joomla\CMS\Event\Application\AfterRouteEvent;
+use Joomla\CMS\Event\Application\BeforeCompileHeadEvent;
 use Joomla\CMS\Event\PageCache\SetCachingEvent;
 use Joomla\CMS\Factory;
 use Joomla\CMS\Plugin\CMSPlugin;
@@ -81,14 +83,20 @@ private function isAuthorisedDisplayChecker(): bool
     /**
      * Init the checker.
      *
+     * @param  AfterRouteEvent $event  The event object
+     *
      * @return  void
      *
      * @since   4.1.0
      */
-    public function initJooa11y()
+    public function initJooa11y(AfterRouteEvent $event)
     {
+        if (!$event->getApplication()->isClient('site')) {
+            return;
+        }
+
         // Check if we are in a preview modal or the plugin has enforced loading
-        $showJooa11y = $this->getApplication()
+        $showJooa11y = $event->getApplication()
             ->getInput()
             ->get('jooa11y', $this->params->get('showAlways', 0));
 
@@ -112,17 +120,19 @@ static function (SetCachingEvent $event) {
     /**
      * Add the checker.
      *
+     * @param BeforeCompileHeadEvent $event The event object
+     *
      * @return  void
      *
      * @since   __DEPLOY_VERSION__
      */
-    public function addJooa11y()
+    public function addJooa11y(BeforeCompileHeadEvent $event)
     {
         // Load translations
         $this->loadLanguage();
 
         // Detect the current active language
-        $getLang = $this->getApplication()
+        $getLang = $event->getApplication()
             ->getLanguage()
             ->getTag();
 
@@ -177,7 +187,7 @@ public function addJooa11y()
 
         // Get the document object
         /** @var \Joomla\CMS\Document\HtmlDocument $document */
-        $document = $this->getApplication()->getDocument();
+        $document = $event->getDocument();
 
         // Get plugin options from xml
         $getOptions = [
diff --git a/plugins/system/languagecode/services/provider.php b/plugins/system/languagecode/services/provider.php
index 4c9dc596d73a6..a021326433d89 100644
--- a/plugins/system/languagecode/services/provider.php
+++ b/plugins/system/languagecode/services/provider.php
@@ -11,7 +11,6 @@
 \defined('_JEXEC') or die;
 
 use Joomla\CMS\Extension\PluginInterface;
-use Joomla\CMS\Factory;
 use Joomla\CMS\Plugin\PluginHelper;
 use Joomla\DI\Container;
 use Joomla\DI\ServiceProviderInterface;
@@ -37,7 +36,6 @@ function (Container $container) {
                     $container->get(DispatcherInterface::class),
                     (array) PluginHelper::getPlugin('system', 'languagecode')
                 );
-                $plugin->setApplication(Factory::getApplication());
 
                 return $plugin;
             }
diff --git a/plugins/system/languagecode/src/Extension/LanguageCode.php b/plugins/system/languagecode/src/Extension/LanguageCode.php
index c5a6560f48063..e3ecf6a69ec75 100644
--- a/plugins/system/languagecode/src/Extension/LanguageCode.php
+++ b/plugins/system/languagecode/src/Extension/LanguageCode.php
@@ -10,10 +10,12 @@
 
 namespace Joomla\Plugin\System\LanguageCode\Extension;
 
-use Joomla\CMS\Form\Form;
+use Joomla\CMS\Event\Application\AfterRenderEvent;
+use Joomla\CMS\Event\Model\PrepareFormEvent;
 use Joomla\CMS\Language\LanguageHelper;
 use Joomla\CMS\Language\Text;
 use Joomla\CMS\Plugin\CMSPlugin;
+use Joomla\Event\SubscriberInterface;
 
 // phpcs:disable PSR1.Files.SideEffects
 \defined('_JEXEC') or die;
@@ -24,24 +26,43 @@
  *
  * @since  2.5
  */
-final class LanguageCode extends CMSPlugin
+final class LanguageCode extends CMSPlugin implements SubscriberInterface
 {
+    /**
+     * Returns an array of events this subscriber will listen to.
+     *
+     * @return array
+     *
+     * @since   __DEPLOY_VERSION__
+     */
+    public static function getSubscribedEvents(): array
+    {
+        return [
+            'onAfterRender'        => 'onAfterRender',
+            'onContentPrepareForm' => 'onContentPrepareForm',
+        ];
+    }
+
     /**
      * Plugin that changes the language code used in the <html /> tag.
      *
+     * @param   AfterRenderEvent $event  The event instance.
+     *
      * @return  void
      *
      * @since   2.5
      */
-    public function onAfterRender()
+    public function onAfterRender(AfterRenderEvent $event): void
     {
+        $app = $event->getApplication();
+
         // Use this plugin only in site application.
-        if ($this->getApplication()->isClient('site')) {
+        if ($app->isClient('site')) {
             // Get the response body.
-            $body = $this->getApplication()->getBody();
+            $body = $app->getBody();
 
             // Get the current language code.
-            $code = $this->getApplication()->getDocument()->getLanguage();
+            $code = $app->getDocument()->getLanguage();
 
             // Get the new code.
             $new_code  = $this->params->get($code);
@@ -97,25 +118,26 @@ public function onAfterRender()
                 }
             }
 
-            $this->getApplication()->setBody(preg_replace($patterns, $replace, $body));
+            $app->setBody(preg_replace($patterns, $replace, $body));
         }
     }
 
     /**
      * Prepare form.
      *
-     * @param   Form   $form  The form to be altered.
-     * @param   mixed  $data  The associated data for the form.
+     * @param   PrepareFormEvent  $event  The event object
      *
-     * @return  boolean
+     * @return  void
      *
      * @since   2.5
      */
-    public function onContentPrepareForm(Form $form, $data)
+    public function onContentPrepareForm(PrepareFormEvent $event): void
     {
+        $form = $event->getForm();
+
         // Check we are manipulating the languagecode plugin.
         if ($form->getName() !== 'com_plugins.plugin' || !$form->getField('languagecodeplugin', 'params')) {
-            return true;
+            return;
         }
 
         // Get site languages.
@@ -145,7 +167,5 @@ public function onContentPrepareForm(Form $form, $data)
 					</form>');
             }
         }
-
-        return true;
     }
 }
diff --git a/plugins/system/log/services/provider.php b/plugins/system/log/services/provider.php
index d355f0484da14..669bd216596b4 100644
--- a/plugins/system/log/services/provider.php
+++ b/plugins/system/log/services/provider.php
@@ -11,7 +11,6 @@
 \defined('_JEXEC') or die;
 
 use Joomla\CMS\Extension\PluginInterface;
-use Joomla\CMS\Factory;
 use Joomla\CMS\Plugin\PluginHelper;
 use Joomla\DI\Container;
 use Joomla\DI\ServiceProviderInterface;
@@ -37,7 +36,6 @@ function (Container $container) {
                     $container->get(DispatcherInterface::class),
                     (array) PluginHelper::getPlugin('system', 'log')
                 );
-                $plugin->setApplication(Factory::getApplication());
 
                 return $plugin;
             }
diff --git a/plugins/system/log/src/Extension/Log.php b/plugins/system/log/src/Extension/Log.php
index b0d16a75a6ed6..748ca8d51bb09 100644
--- a/plugins/system/log/src/Extension/Log.php
+++ b/plugins/system/log/src/Extension/Log.php
@@ -11,8 +11,10 @@
 namespace Joomla\Plugin\System\Log\Extension;
 
 use Joomla\CMS\Authentication\Authentication;
+use Joomla\CMS\Event\User\LoginFailureEvent;
 use Joomla\CMS\Log\Log as Logger;
 use Joomla\CMS\Plugin\CMSPlugin;
+use Joomla\Event\SubscriberInterface;
 
 // phpcs:disable PSR1.Files.SideEffects
 \defined('_JEXEC') or die;
@@ -23,19 +25,34 @@
  *
  * @since  1.5
  */
-final class Log extends CMSPlugin
+final class Log extends CMSPlugin implements SubscriberInterface
 {
+    /**
+     * Returns an array of events this subscriber will listen to.
+     *
+     * @return array
+     *
+     * @since   __DEPLOY_VERSION__
+     */
+    public static function getSubscribedEvents(): array
+    {
+        return [
+            'onUserLoginFailure' => 'onUserLoginFailure',
+        ];
+    }
+
     /**
      * Called if user fails to be logged in.
      *
-     * @param   array  $response  Array of response data.
+     * @param   LoginFailureEvent $event  The event instance.
      *
      * @return  void
      *
      * @since   1.5
      */
-    public function onUserLoginFailure($response)
+    public function onUserLoginFailure(LoginFailureEvent $event): void
     {
+        $response = $event->getAuthenticationResponse();
         $errorlog = [];
 
         switch ($response['status']) {
diff --git a/plugins/system/logout/src/Extension/Logout.php b/plugins/system/logout/src/Extension/Logout.php
index 10751fecefedd..046b5288c41ed 100644
--- a/plugins/system/logout/src/Extension/Logout.php
+++ b/plugins/system/logout/src/Extension/Logout.php
@@ -12,8 +12,10 @@
 
 use Joomla\CMS\Application\ApplicationHelper;
 use Joomla\CMS\Application\CMSApplicationInterface;
+use Joomla\CMS\Event\User\LogoutEvent;
 use Joomla\CMS\Plugin\CMSPlugin;
 use Joomla\Event\DispatcherInterface;
+use Joomla\Event\SubscriberInterface;
 
 // phpcs:disable PSR1.Files.SideEffects
 \defined('_JEXEC') or die;
@@ -24,7 +26,7 @@
  *
  * @since  1.6
  */
-final class Logout extends CMSPlugin
+final class Logout extends CMSPlugin implements SubscriberInterface
 {
     /**
      * @param   DispatcherInterface      $dispatcher  The object to observe -- event dispatcher.
@@ -58,17 +60,30 @@ public function __construct(DispatcherInterface $dispatcher, array $config, CMSA
         }
     }
 
+    /**
+     * Returns an array of events this subscriber will listen to.
+     *
+     * @return array
+     *
+     * @since   __DEPLOY_VERSION__
+     */
+    public static function getSubscribedEvents(): array
+    {
+        return [
+            'onUserLogout' => 'onUserLogout',
+        ];
+    }
+
     /**
      * Method to handle any logout logic and report back to the subject.
      *
-     * @param   array  $user     Holds the user data.
-     * @param   array  $options  Array holding options (client, ...).
+     * @param   LogoutEvent $event  The event instance.
      *
-     * @return  boolean  Always returns true.
+     * @return  void
      *
      * @since   1.6
      */
-    public function onUserLogout($user, $options = [])
+    public function onUserLogout(LogoutEvent $event): void
     {
         if ($this->getApplication()->isClient('site')) {
             // Create the cookie.
@@ -82,7 +97,5 @@ public function onUserLogout($user, $options = [])
                 true
             );
         }
-
-        return true;
     }
 }
diff --git a/plugins/system/privacyconsent/src/Extension/PrivacyConsent.php b/plugins/system/privacyconsent/src/Extension/PrivacyConsent.php
index 5fe442701b753..af11e84e8f031 100644
--- a/plugins/system/privacyconsent/src/Extension/PrivacyConsent.php
+++ b/plugins/system/privacyconsent/src/Extension/PrivacyConsent.php
@@ -10,9 +10,11 @@
 
 namespace Joomla\Plugin\System\PrivacyConsent\Extension;
 
+use Joomla\CMS\Event\Application\AfterRouteEvent;
+use Joomla\CMS\Event\Model;
 use Joomla\CMS\Event\Privacy\CheckPrivacyPolicyPublishedEvent;
+use Joomla\CMS\Event\User;
 use Joomla\CMS\Factory;
-use Joomla\CMS\Form\Form;
 use Joomla\CMS\Form\FormHelper;
 use Joomla\CMS\Language\Associations;
 use Joomla\CMS\Language\Text;
@@ -21,6 +23,7 @@
 use Joomla\Component\Actionlogs\Administrator\Model\ActionlogModel;
 use Joomla\Database\DatabaseAwareTrait;
 use Joomla\Database\ParameterType;
+use Joomla\Event\SubscriberInterface;
 use Joomla\Utilities\ArrayHelper;
 
 // phpcs:disable PSR1.Files.SideEffects
@@ -32,27 +35,48 @@
  *
  * @since  3.9.0
  */
-final class PrivacyConsent extends CMSPlugin
+final class PrivacyConsent extends CMSPlugin implements SubscriberInterface
 {
     use DatabaseAwareTrait;
 
+    /**
+     * Returns an array of events this subscriber will listen to.
+     *
+     * @return array
+     *
+     * @since   __DEPLOY_VERSION__
+     */
+    public static function getSubscribedEvents(): array
+    {
+        return [
+            'onContentPrepareForm'                 => 'onContentPrepareForm',
+            'onUserBeforeSave'                     => 'onUserBeforeSave',
+            'onUserAfterSave'                      => 'onUserAfterSave',
+            'onUserAfterDelete'                    => 'onUserAfterDelete',
+            'onAfterRoute'                         => 'onAfterRoute',
+            'onPrivacyCheckPrivacyPolicyPublished' => 'onPrivacyCheckPrivacyPolicyPublished',
+        ];
+    }
+
     /**
      * Adds additional fields to the user editing form
      *
-     * @param   Form   $form  The form to be altered.
-     * @param   mixed  $data  The associated data for the form.
+     * @param   Model\PrepareFormEvent  $event  The event instance.
      *
-     * @return  boolean
+     * @return  void
      *
      * @since   3.9.0
      */
-    public function onContentPrepareForm(Form $form, $data)
+    public function onContentPrepareForm(Model\PrepareFormEvent $event): void
     {
+        $form = $event->getForm();
+        $data = $event->getData();
+
         // Check we are manipulating a valid form - we only display this on user registration form and user profile form.
         $name = $form->getName();
 
         if (!\in_array($name, ['com_users.profile', 'com_users.registration'])) {
-            return true;
+            return;
         }
 
         // Load plugin language files
@@ -63,7 +87,7 @@ public function onContentPrepareForm(Form $form, $data)
             $userId = $data->id ?? 0;
 
             if ($userId > 0 && $this->isUserConsented($userId)) {
-                return true;
+                return;
             }
         }
 
@@ -79,29 +103,26 @@ public function onContentPrepareForm(Form $form, $data)
         // Push the privacy article ID into the privacy field.
         $form->setFieldAttribute('privacy', $privacyType, $privacyId, 'privacyconsent');
         $form->setFieldAttribute('privacy', 'note', $privacynote, 'privacyconsent');
-
-        return true;
     }
 
     /**
      * Method is called before user data is stored in the database
      *
-     * @param   array    $user   Holds the old user data.
-     * @param   boolean  $isNew  True if a new user is stored.
-     * @param   array    $data   Holds the new user data.
+     * @param   User\BeforeSaveEvent  $event  The event instance.
      *
-     * @return  boolean
+     * @return  void
      *
      * @since   3.9.0
      * @throws  \InvalidArgumentException on missing required data.
      */
-    public function onUserBeforeSave($user, $isNew, $data)
+    public function onUserBeforeSave(User\BeforeSaveEvent $event): void
     {
         // // Only check for front-end user creation/update profile
         if ($this->getApplication()->isClient('administrator')) {
-            return true;
+            return;
         }
 
+        $user   = $event->getUser();
         $userId = ArrayHelper::getValue($user, 'id', 0, 'int');
 
         // Load plugin language files
@@ -109,7 +130,7 @@ public function onUserBeforeSave($user, $isNew, $data)
 
         // User already consented before, no need to check it further
         if ($userId > 0 && $this->isUserConsented($userId)) {
-            return true;
+            return;
         }
 
         // Check that the privacy is checked if required ie only in registration from frontend.
@@ -124,23 +145,18 @@ public function onUserBeforeSave($user, $isNew, $data)
         ) {
             throw new \InvalidArgumentException($this->getApplication()->getLanguage()->_('PLG_SYSTEM_PRIVACYCONSENT_FIELD_ERROR'));
         }
-
-        return true;
     }
 
     /**
      * Saves user privacy confirmation
      *
-     * @param   array    $data    entered user data
-     * @param   boolean  $isNew   true if this is a new user
-     * @param   boolean  $result  true if saving the user worked
-     * @param   string   $error   error message
+     * @param   User\AfterSaveEvent  $event  The event instance.
      *
      * @return  void
      *
      * @since   3.9.0
      */
-    public function onUserAfterSave($data, $isNew, $result, $error): void
+    public function onUserAfterSave(User\AfterSaveEvent $event): void
     {
         // Only create an entry on front-end user creation/update profile
         if ($this->getApplication()->isClient('administrator')) {
@@ -148,6 +164,7 @@ public function onUserAfterSave($data, $isNew, $result, $error): void
         }
 
         // Get the user's ID
+        $data   = $event->getUser();
         $userId = ArrayHelper::getValue($data, 'id', 0, 'int');
 
         // If user already consented before, no need to check it further
@@ -210,20 +227,19 @@ public function onUserAfterSave($data, $isNew, $result, $error): void
      *
      * Method is called after user data is deleted from the database
      *
-     * @param   array    $user     Holds the user data
-     * @param   boolean  $success  True if user was successfully stored in the database
-     * @param   string   $msg      Message
+     * @param   User\AfterDeleteEvent  $event  The event instance.
      *
      * @return  void
      *
      * @since   3.9.0
      */
-    public function onUserAfterDelete($user, $success, $msg): void
+    public function onUserAfterDelete(User\AfterDeleteEvent $event): void
     {
-        if (!$success) {
+        if (!$event->getDeletingResult()) {
             return;
         }
 
+        $user   = $event->getUser();
         $userId = ArrayHelper::getValue($user, 'id', 0, 'int');
 
         if ($userId) {
@@ -241,18 +257,21 @@ public function onUserAfterDelete($user, $success, $msg): void
      * If logged in users haven't agreed to privacy consent, redirect them to profile edit page, ask them to agree to
      * privacy consent before allowing access to any other pages
      *
+     * @param   AfterRouteEvent  $event  The event instance.
+     *
      * @return  void
      *
      * @since   3.9.0
      */
-    public function onAfterRoute()
+    public function onAfterRoute(AfterRouteEvent $event): void
     {
         // Run this in frontend only
         if (!$this->getApplication()->isClient('site')) {
             return;
         }
 
-        $userId = $this->getApplication()->getIdentity()->id;
+        $app    = $this->getApplication();
+        $userId = $app->getIdentity()->id;
 
         // Check to see whether user already consented, if not, redirect to user profile page
         if ($userId > 0) {
@@ -264,7 +283,7 @@ public function onAfterRoute()
                 return;
             }
 
-            $input  = $this->getApplication()->getInput();
+            $input  = $app->getInput();
             $option = $input->getCmd('option');
             $task   = $input->get('task', '');
             $view   = $input->getString('view', '');
@@ -297,9 +316,9 @@ public function onAfterRoute()
             }
 
             // Redirect to com_users profile edit
-            $this->getApplication()->enqueueMessage($this->getRedirectMessage(), 'notice');
+            $app->enqueueMessage($this->getRedirectMessage(), 'notice');
             $link = 'index.php?option=com_users&view=profile&layout=edit';
-            $this->getApplication()->redirect(Route::_($link, false));
+            $app->redirect(Route::_($link, false));
         }
     }
 
diff --git a/plugins/system/remember/src/Extension/Remember.php b/plugins/system/remember/src/Extension/Remember.php
index 3956f750b9104..e7c92409bd20e 100644
--- a/plugins/system/remember/src/Extension/Remember.php
+++ b/plugins/system/remember/src/Extension/Remember.php
@@ -10,11 +10,15 @@
 
 namespace Joomla\Plugin\System\Remember\Extension;
 
+use Joomla\CMS\Event\Application\AfterInitialiseEvent;
+use Joomla\CMS\Event\User\BeforeSaveEvent;
+use Joomla\CMS\Event\User\LogoutEvent;
 use Joomla\CMS\Log\Log;
 use Joomla\CMS\Plugin\CMSPlugin;
 use Joomla\CMS\Plugin\PluginHelper;
 use Joomla\CMS\User\UserHelper;
 use Joomla\Database\DatabaseAwareTrait;
+use Joomla\Event\SubscriberInterface;
 
 // phpcs:disable PSR1.Files.SideEffects
 \defined('_JEXEC') or die;
@@ -25,34 +29,54 @@
  *
  * @since  1.5
  */
-final class Remember extends CMSPlugin
+final class Remember extends CMSPlugin implements SubscriberInterface
 {
     use DatabaseAwareTrait;
 
+    /**
+     * Returns an array of events this subscriber will listen to.
+     *
+     * @return array
+     *
+     * @since   __DEPLOY_VERSION__
+     */
+    public static function getSubscribedEvents(): array
+    {
+        return [
+            'onAfterInitialise' => 'onAfterInitialise',
+            'onUserLogout'      => 'onUserLogout',
+            'onUserBeforeSave'  => 'onUserBeforeSave',
+        ];
+    }
+
     /**
      * Remember me method to run onAfterInitialise
      * Only purpose is to initialise the login authentication process if a cookie is present
      *
+     * @param   AfterInitialiseEvent  $event  The event instance.
+     *
      * @return  void
      *
      * @since   1.5
      *
      * @throws  \InvalidArgumentException
      */
-    public function onAfterInitialise()
+    public function onAfterInitialise(AfterInitialiseEvent $event): void
     {
         // No remember me for admin.
         if (!$this->getApplication()->isClient('site')) {
             return;
         }
 
+        $app = $this->getApplication();
+
         // Check for a cookie if user is not logged in
-        if ($this->getApplication()->getIdentity()->guest) {
+        if ($app->getIdentity()->guest) {
             $cookieName = 'joomla_remember_me_' . UserHelper::getShortHashedUserAgent();
 
             // Check for the cookie
-            if ($this->getApplication()->getInput()->cookie->get($cookieName)) {
-                $this->getApplication()->login(['username' => ''], ['silent' => true]);
+            if ($app->getInput()->cookie->get($cookieName)) {
+                $app->login(['username' => ''], ['silent' => true]);
             }
         }
     }
@@ -60,16 +84,15 @@ public function onAfterInitialise()
     /**
      * Imports the authentication plugin on user logout to make sure that the cookie is destroyed.
      *
-     * @param   array  $user     Holds the user data.
-     * @param   array  $options  Array holding options (remember, autoregister, group).
+     * @param   LogoutEvent $event  The event instance.
      *
-     * @return  boolean
+     * @return  void
      */
-    public function onUserLogout($user, $options)
+    public function onUserLogout(LogoutEvent $event): void
     {
         // No remember me for admin
         if (!$this->getApplication()->isClient('site')) {
-            return true;
+            return;
         }
 
         $cookieName = 'joomla_remember_me_' . UserHelper::getShortHashedUserAgent();
@@ -79,32 +102,32 @@ public function onUserLogout($user, $options)
             // Make sure authentication group is loaded to process onUserAfterLogout event
             PluginHelper::importPlugin('authentication');
         }
-
-        return true;
     }
 
     /**
      * Method is called before user data is stored in the database
      * Invalidate all existing remember-me cookies after a password change
      *
-     * @param   array    $user   Holds the old user data.
-     * @param   boolean  $isnew  True if a new user is stored.
-     * @param   array    $data   Holds the new user data.
+     * @param   BeforeSaveEvent $event  The event instance.
      *
      * @return  boolean
      *
      * @since   3.8.6
      */
-    public function onUserBeforeSave($user, $isnew, $data)
+    public function onUserBeforeSave(BeforeSaveEvent $event): void
     {
+        $user  = $event->getUser();
+        $isnew = $event->getIsNew();
+        $data  = $event->getData();
+
         // Irrelevant on new users
         if ($isnew) {
-            return true;
+            return;
         }
 
         // Irrelevant, because password was not changed by user
         if (empty($data['password_clear'])) {
-            return true;
+            return;
         }
 
         // But now, we need to do something - Delete all tokens for this user!
@@ -124,7 +147,5 @@ public function onUserBeforeSave($user, $isnew, $data)
                 'security'
             );
         }
-
-        return true;
     }
 }
diff --git a/plugins/system/skipto/services/provider.php b/plugins/system/skipto/services/provider.php
index 274dcebf053e4..84efa5e700f97 100644
--- a/plugins/system/skipto/services/provider.php
+++ b/plugins/system/skipto/services/provider.php
@@ -11,7 +11,6 @@
 \defined('_JEXEC') or die;
 
 use Joomla\CMS\Extension\PluginInterface;
-use Joomla\CMS\Factory;
 use Joomla\CMS\Plugin\PluginHelper;
 use Joomla\DI\Container;
 use Joomla\DI\ServiceProviderInterface;
@@ -37,7 +36,6 @@ function (Container $container) {
                     $container->get(DispatcherInterface::class),
                     (array) PluginHelper::getPlugin('system', 'skipto')
                 );
-                $plugin->setApplication(Factory::getApplication());
 
                 return $plugin;
             }
diff --git a/plugins/system/skipto/src/Extension/Skipto.php b/plugins/system/skipto/src/Extension/Skipto.php
index a36f038f08458..9d1d1ecfb994d 100644
--- a/plugins/system/skipto/src/Extension/Skipto.php
+++ b/plugins/system/skipto/src/Extension/Skipto.php
@@ -10,7 +10,9 @@
 
 namespace Joomla\Plugin\System\Skipto\Extension;
 
+use Joomla\CMS\Event\Application\AfterDispatchEvent;
 use Joomla\CMS\Plugin\CMSPlugin;
+use Joomla\Event\SubscriberInterface;
 
 // phpcs:disable PSR1.Files.SideEffects
 \defined('_JEXEC') or die;
@@ -21,32 +23,49 @@
  *
  * @since  4.0.0
  */
-final class Skipto extends CMSPlugin
+final class Skipto extends CMSPlugin implements SubscriberInterface
 {
+    /**
+     * Returns an array of events this subscriber will listen to.
+     *
+     * @return array
+     *
+     * @since   __DEPLOY_VERSION__
+     */
+    public static function getSubscribedEvents(): array
+    {
+        return [
+            'onAfterDispatch' => 'onAfterDispatch',
+        ];
+    }
+
     /**
      * Add the skipto navigation menu.
      *
+     * @param   AfterDispatchEvent  $event  The event instance.
+     *
      * @return  void
      *
      * @since   4.0.0
      */
-    public function onAfterDispatch()
+    public function onAfterDispatch(AfterDispatchEvent $event): void
     {
         $section = $this->params->get('section', 'administrator');
+        $app     = $event->getApplication();
 
-        if ($section !== 'both' && $this->getApplication()->isClient($section) !== true) {
+        if ($section !== 'both' && $app->isClient($section) !== true) {
             return;
         }
 
         // Get the document object.
-        $document = $this->getApplication()->getDocument();
+        $document = $app->getDocument();
 
         if ($document->getType() !== 'html') {
             return;
         }
 
         // Are we in a modal?
-        if ($this->getApplication()->getInput()->get('tmpl', '', 'cmd') === 'component') {
+        if ($app->getInput()->get('tmpl', '', 'cmd') === 'component') {
             return;
         }
 
@@ -68,24 +87,24 @@ public function onAfterDispatch()
                         'displayOption' => 'popup',
 
                         // Button labels and messages
-                        'buttonLabel'            => $this->getApplication()->getLanguage()->_('PLG_SYSTEM_SKIPTO_TITLE'),
-                        'buttonTooltipAccesskey' => $this->getApplication()->getLanguage()->_('PLG_SYSTEM_SKIPTO_ACCESS_KEY'),
+                        'buttonLabel'            => $app->getLanguage()->_('PLG_SYSTEM_SKIPTO_TITLE'),
+                        'buttonTooltipAccesskey' => $app->getLanguage()->_('PLG_SYSTEM_SKIPTO_ACCESS_KEY'),
 
                         // Menu labels and messages
-                        'landmarkGroupLabel'  => $this->getApplication()->getLanguage()->_('PLG_SYSTEM_SKIPTO_LANDMARK'),
-                        'headingGroupLabel'   => $this->getApplication()->getLanguage()->_('PLG_SYSTEM_SKIPTO_HEADING'),
-                        'mofnGroupLabel'      => $this->getApplication()->getLanguage()->_('PLG_SYSTEM_SKIPTO_HEADING_MOFN'),
-                        'headingLevelLabel'   => $this->getApplication()->getLanguage()->_('PLG_SYSTEM_SKIPTO_HEADING_LEVEL'),
-                        'mainLabel'           => $this->getApplication()->getLanguage()->_('PLG_SYSTEM_SKIPTO_LANDMARK_MAIN'),
-                        'searchLabel'         => $this->getApplication()->getLanguage()->_('PLG_SYSTEM_SKIPTO_LANDMARK_SEARCH'),
-                        'navLabel'            => $this->getApplication()->getLanguage()->_('PLG_SYSTEM_SKIPTO_LANDMARK_NAV'),
-                        'regionLabel'         => $this->getApplication()->getLanguage()->_('PLG_SYSTEM_SKIPTO_LANDMARK_REGION'),
-                        'asideLabel'          => $this->getApplication()->getLanguage()->_('PLG_SYSTEM_SKIPTO_LANDMARK_ASIDE'),
-                        'footerLabel'         => $this->getApplication()->getLanguage()->_('PLG_SYSTEM_SKIPTO_LANDMARK_FOOTER'),
-                        'headerLabel'         => $this->getApplication()->getLanguage()->_('PLG_SYSTEM_SKIPTO_LANDMARK_HEADER'),
-                        'formLabel'           => $this->getApplication()->getLanguage()->_('PLG_SYSTEM_SKIPTO_LANDMARK_FORM'),
-                        'msgNoLandmarksFound' => $this->getApplication()->getLanguage()->_('PLG_SYSTEM_SKIPTO_LANDMARK_NONE'),
-                        'msgNoHeadingsFound'  => $this->getApplication()->getLanguage()->_('PLG_SYSTEM_SKIPTO_HEADING_NONE'),
+                        'landmarkGroupLabel'  => $app->getLanguage()->_('PLG_SYSTEM_SKIPTO_LANDMARK'),
+                        'headingGroupLabel'   => $app->getLanguage()->_('PLG_SYSTEM_SKIPTO_HEADING'),
+                        'mofnGroupLabel'      => $app->getLanguage()->_('PLG_SYSTEM_SKIPTO_HEADING_MOFN'),
+                        'headingLevelLabel'   => $app->getLanguage()->_('PLG_SYSTEM_SKIPTO_HEADING_LEVEL'),
+                        'mainLabel'           => $app->getLanguage()->_('PLG_SYSTEM_SKIPTO_LANDMARK_MAIN'),
+                        'searchLabel'         => $app->getLanguage()->_('PLG_SYSTEM_SKIPTO_LANDMARK_SEARCH'),
+                        'navLabel'            => $app->getLanguage()->_('PLG_SYSTEM_SKIPTO_LANDMARK_NAV'),
+                        'regionLabel'         => $app->getLanguage()->_('PLG_SYSTEM_SKIPTO_LANDMARK_REGION'),
+                        'asideLabel'          => $app->getLanguage()->_('PLG_SYSTEM_SKIPTO_LANDMARK_ASIDE'),
+                        'footerLabel'         => $app->getLanguage()->_('PLG_SYSTEM_SKIPTO_LANDMARK_FOOTER'),
+                        'headerLabel'         => $app->getLanguage()->_('PLG_SYSTEM_SKIPTO_LANDMARK_HEADER'),
+                        'formLabel'           => $app->getLanguage()->_('PLG_SYSTEM_SKIPTO_LANDMARK_FORM'),
+                        'msgNoLandmarksFound' => $app->getLanguage()->_('PLG_SYSTEM_SKIPTO_LANDMARK_NONE'),
+                        'msgNoHeadingsFound'  => $app->getLanguage()->_('PLG_SYSTEM_SKIPTO_HEADING_NONE'),
 
                         // Selectors for landmark and headings sections
                         'headings'  => 'h1, h2, h3',
diff --git a/plugins/system/stats/src/Extension/Stats.php b/plugins/system/stats/src/Extension/Stats.php
index 13f6cb16248d7..94cb2b35ee6d9 100644
--- a/plugins/system/stats/src/Extension/Stats.php
+++ b/plugins/system/stats/src/Extension/Stats.php
@@ -11,12 +11,17 @@
 namespace Joomla\Plugin\System\Stats\Extension;
 
 use Joomla\CMS\Cache\Cache;
+use Joomla\CMS\Event\Application\AfterDispatchEvent;
+use Joomla\CMS\Event\Application\AfterInitialiseEvent;
+use Joomla\CMS\Event\Plugin\AjaxEvent;
+use Joomla\CMS\Event\Plugin\System\Stats\GetStatsDataEvent;
 use Joomla\CMS\Http\HttpFactory;
 use Joomla\CMS\Layout\FileLayout;
 use Joomla\CMS\Log\Log;
 use Joomla\CMS\Plugin\CMSPlugin;
 use Joomla\CMS\User\UserHelper;
 use Joomla\Database\DatabaseAwareTrait;
+use Joomla\Event\SubscriberInterface;
 
 // phpcs:disable PSR1.Files.SideEffects
 \defined('_JEXEC') or die;
@@ -31,7 +36,7 @@
  *
  * @since  3.5
  */
-final class Stats extends CMSPlugin
+final class Stats extends CMSPlugin implements SubscriberInterface
 {
     use DatabaseAwareTrait;
 
@@ -71,14 +76,35 @@ final class Stats extends CMSPlugin
      */
     protected $uniqueId;
 
+    /**
+     * Returns an array of events this subscriber will listen to.
+     *
+     * @return array
+     *
+     * @since   __DEPLOY_VERSION__
+     */
+    public static function getSubscribedEvents(): array
+    {
+        return [
+            'onAfterInitialise' => 'onAfterInitialise',
+            'onAfterDispatch'   => 'onAfterDispatch',
+            'onAjaxSendAlways'  => 'onAjaxSendAlways',
+            'onAjaxSendNever'   => 'onAjaxSendNever',
+            'onAjaxSendStats'   => 'onAjaxSendStats',
+            'onGetStatsData'    => 'onGetStatsData',
+        ];
+    }
+
     /**
      * Listener for the `onAfterInitialise` event
      *
+     * @param   AfterInitialiseEvent  $event  The event instance.
+     *
      * @return  void
      *
      * @since   3.5
      */
-    public function onAfterInitialise()
+    public function onAfterInitialise(AfterInitialiseEvent $event): void
     {
         if (!$this->getApplication()->isClient('administrator') || !$this->isAllowedUser()) {
             return;
@@ -103,11 +129,13 @@ public function onAfterInitialise()
     /**
      * Listener for the `onAfterDispatch` event
      *
+     * @param   AfterDispatchEvent  $event  The event instance.
+     *
      * @return  void
      *
      * @since   4.0.0
      */
-    public function onAfterDispatch()
+    public function onAfterDispatch(AfterDispatchEvent $event): void
     {
         if (!$this->getApplication()->isClient('administrator') || !$this->isAllowedUser()) {
             return;
@@ -136,6 +164,8 @@ public function onAfterDispatch()
     /**
      * User selected to always send data
      *
+     * @param   AjaxEvent  $event  The event instance.
+     *
      * @return  void
      *
      * @since   3.5
@@ -143,7 +173,7 @@ public function onAfterDispatch()
      * @throws  \Exception         If user is not allowed.
      * @throws  \RuntimeException  If there is an error saving the params or sending the data.
      */
-    public function onAjaxSendAlways()
+    public function onAjaxSendAlways(AjaxEvent $event): void
     {
         if (!$this->isAllowedUser() || !$this->isAjaxRequest()) {
             throw new \Exception($this->getApplication()->getLanguage()->_('JGLOBAL_AUTH_ACCESS_DENIED'), 403);
@@ -155,12 +185,14 @@ public function onAjaxSendAlways()
             throw new \RuntimeException('Unable to save plugin settings', 500);
         }
 
-        echo json_encode(['sent' => (int) $this->sendStats()]);
+        $event->updateEventResult(json_encode(['sent' => (int) $this->sendStats()]));
     }
 
     /**
      * User selected to never send data.
      *
+     * @param   AjaxEvent  $event  The event instance.
+     *
      * @return  void
      *
      * @since   3.5
@@ -168,7 +200,7 @@ public function onAjaxSendAlways()
      * @throws  \Exception         If user is not allowed.
      * @throws  \RuntimeException  If there is an error saving the params.
      */
-    public function onAjaxSendNever()
+    public function onAjaxSendNever(AjaxEvent $event): void
     {
         if (!$this->isAllowedUser() || !$this->isAjaxRequest()) {
             throw new \Exception($this->getApplication()->getLanguage()->_('JGLOBAL_AUTH_ACCESS_DENIED'), 403);
@@ -184,13 +216,15 @@ public function onAjaxSendNever()
             throw new \RuntimeException('Unable to disable the statistics plugin', 500);
         }
 
-        echo json_encode(['sent' => 0]);
+        $event->updateEventResult(json_encode(['sent' => 0]));
     }
 
     /**
      * Send the stats to the server.
      * On first load | on demand mode it will show a message asking users to select mode.
      *
+     * @param   AjaxEvent  $event  The event instance.
+     *
      * @return  void
      *
      * @since   3.5
@@ -198,7 +232,7 @@ public function onAjaxSendNever()
      * @throws  \Exception         If user is not allowed.
      * @throws  \RuntimeException  If there is an error saving the params, disabling the plugin or sending the data.
      */
-    public function onAjaxSendStats()
+    public function onAjaxSendStats(AjaxEvent $event): void
     {
         if (!$this->isAllowedUser() || !$this->isAjaxRequest()) {
             throw new \Exception($this->getApplication()->getLanguage()->_('JGLOBAL_AUTH_ACCESS_DENIED'), 403);
@@ -211,7 +245,7 @@ public function onAjaxSendStats()
                 'html' => $this->getRenderer('message')->render($this->getLayoutData()),
             ];
 
-            echo json_encode($data);
+            $event->updateEventResult(json_encode($data));
 
             return;
         }
@@ -220,21 +254,21 @@ public function onAjaxSendStats()
             throw new \RuntimeException('Unable to save plugin settings', 500);
         }
 
-        echo json_encode(['sent' => (int) $this->sendStats()]);
+        $event->updateEventResult(json_encode(['sent' => (int) $this->sendStats()]));
     }
 
     /**
      * Get the data through events
      *
-     * @param   string  $context  Context where this will be called from
+     * @param   GetStatsDataEvent $event  The event instance.
      *
-     * @return  array
+     * @return  void
      *
      * @since   3.5
      */
-    public function onGetStatsData($context)
+    public function onGetStatsData(GetStatsDataEvent $event): void
     {
-        return $this->getStatsData();
+        $event->addResult($this->getStatsData());
     }
 
     /**
diff --git a/plugins/system/stats/src/Field/DataField.php b/plugins/system/stats/src/Field/DataField.php
index 76db862824ba9..4709986b7cb16 100644
--- a/plugins/system/stats/src/Field/DataField.php
+++ b/plugins/system/stats/src/Field/DataField.php
@@ -10,6 +10,7 @@
 
 namespace Joomla\Plugin\System\Stats\Field;
 
+use Joomla\CMS\Event\Plugin\System\Stats\GetStatsDataEvent;
 use Joomla\CMS\Factory;
 use Joomla\CMS\Plugin\PluginHelper;
 
@@ -53,7 +54,10 @@ protected function getLayoutData()
 
         PluginHelper::importPlugin('system', 'stats');
 
-        $result = Factory::getApplication()->triggerEvent('onGetStatsData', ['stats.field.data']);
+        $result = Factory::getApplication()->getDispatcher()->dispatch(
+            'onGetStatsData',
+            new GetStatsDataEvent('onGetStatsData', ['context' => 'stats.field.data'])
+        )->getArgument('result', []);
 
         $data['statsData'] = $result ? reset($result) : [];