In any calendar view with a time grid, you can drag and drop to reschedule events.
If you need to reschedule many events quickly, or move events across a long date range of many weeks or months, use Year view.
You can quickly reschedule events by dragging them to the new date, as shown here (click the image below to enlarge it):
Switch to Year view in your own Teamup calendar or try it out on the Year view live demo.