Ability to drag and drop events

[thepaulfox]

Describe the feature you'd like to request

As a marketing manager, I'd like to be able to update the campaign dates by moving them around on the calendar so that I don't have to go to a different page to make updates.

Describe the solution you'd like

Implement this feature:
https://fullcalendar.io/docs/external-dragging

Have it update the campaign dates.