Move a bunch of ical events at once
Fast forward 7 years! iCal is now Apple Calendar.

You can now select multiple events and use the keyboard shortcuts:

⌃⌥ [ ↑ | ↓ ] to move the events 15min sooner or later.

⌃⌥ [ ← | → ] to move the events 1 day (in day/week view) or 1 week (in month view) sooner or later.