How to set a Calendar alert for AFTER completion of an event?

I would like to set calendar alerts to happen at the scheduled completion time of my events - whatever that may be. I can't seem to figure out a way to do this. You can create alarms that go off before an event starts, at the start time, or a fixed number of minutes after start time. But is there a way to set an alarm that triggers AT OR AFTER the completion time of an event, without having to specify the exact date & time?

Solution 1:

Just enter an alert at a customized time (which is equal to end of the event).

This works for iCal 5 (Mac OS X 10.7):

and also for iCal 7 (Mac OS X 10.9). It looks a bit different though: