Hello, I've been using Awesome Calendar very well.
I would like to suggest two features regarding convenient rescheduling :

1. Simple Rescheduling by Drag&Drop It will definitely be more convenient to reschedule the date of an event or a to-do by dragging them from a current date slot and then dropping them to a new date slot on a Weekly and Monthly View.

I still have to use the iCal, which is not good but has the drag&drop rescheduling ability, sometimes only because of the feature.

1. Massive(Day) Rescheduling It will help users save considerable time if they can reschedule certain day's whole events or to-dos with just one action, because people often postpone a lot of things whatever the reasons are; Imagine rescheduling a lot of things in 7 days by repeating the same job over and over again. It is obviously a quite terrible job as well as a waste of time.

It can be done by Drag&Drop the day or by clicking 'Move all' button in a pop-up window of a Monthly view and then a new date slot on a Monthly View.