So this demo shows dragging from a container to the calendar which is good. However doesn't appear I can drag an event off the calendar to another container. Tried a few things. I'd like confirm that functionality is not available or doable. thanks.
https://code.daypilot.org/90296/javascript-calendar-custom-drop-target-for-external-items
At this moment, it's not possible to drag events out of the Calendar. However, it's in the queue and it will be added in the near future.