Apps Script between the Form Apps Service and Google Calendar

function setupTrigger() {
  var form = FormApp.openById('YOUR_FORM_ID');
  ScriptApp.newTrigger('addEventToCalendar')
    .forForm(form)
    .onFormSubmit()
    .create();
}

function addEventToCalendar(e) {
  var formResponse = e.response.getItemResponses();
  var eventName = formResponse[0].getResponse();
  var startTime = new Date(formResponse[1].getResponse());
  var endTime = new Date(formResponse[2].getResponse());
  var description = formResponse[3].getResponse();

  var calendarId = 'YOUR_CALENDAR_ID';
  var calendar = CalendarApp.getCalendarById(calendarId);
  var event = calendar.createEvent(eventName, startTime, endTime, {description: description});
  
  Logger.log('Event ID: ' + event.getId());
}