FullCalendar Drag and Drop from one calendar to another

I’m trying to create a control for our shipping department in which one calendar is a day list with appointments that need to be scheduled. I want the users to be able to drag and drop the event from the ‘unscheduled’ calendar to the ‘scheduled’ one, which is set to month view.

I have allow drag and allow drop enabled on both calendars and have editable set to true on both as well. And I’ve changed just about every other property I could find that seemed to have anything to do with this. Tried different view types, all day events, and hour long events…

So, while I am able to click and drag the ‘unscheduled’ events from the first calendar, as soon as I drag outside the border of that calendar my mouse turns into the ‘do not enter’ pointer and the dragged event seems to slide underneath the calendar control I’m trying to drag to.

Any idea what I’m missing… is this something I would need the premium calendar subscription for?

Thanks!