How to copy event via CTRL + Drag&Drop in FullCalendar v4?

问题

This example of copying events doesn't work in FullCalendar v4: https://codepen.io/ally-murray/details/JBdaBV Does anyone know how to make this functionality in the current version? Function "renderEvent" doesn't exist:

$calendar.fullCalendar(
      "renderEvent",
      {
        resourceId,
        title: droppedEvent.title,
        start: startDate,
        end: endDate },
      true);

来源：https://stackoverflow.com/questions/59747863/how-to-copy-event-via-ctrl-dragdrop-in-fullcalendar-v4