code: function(eventData) {
  
      var firstEventStart = moment(eventData[0].start)
      var firstEventEnd = moment(eventData[0].end)
      var firstEventDuration = firstEventEnd.diff(firstEventStart, 'minutes')
  
      if (firstEventDuration <= 90) {
        calendarTarget.fullCalendar('option', 'slotDuration', '00:15:00')
      }
  
      calendarTarget.fullCalendar('addEventSource', {
        events: eventData
      });
  
      calendarTarget.removeClass('empty-calendar');
  
      // Go to first event if enabled
      goToFirstEvent(eventData[0].start);
  
    }
docs: Render the supplied calendar events in FullCalendar