I've created a calendar in iCal that I share with colleagues, who I have given permission to edit. Everything works fine except that I see no way to receive alerts or notifications when they make changes to events in the calendar. They all report that they were given the option to see alerts when they subscribed, but I (as creator of the calendar) was not given any (that I saw).

Is there a way to configure a shared calendar so that the *creator* of the calendar can be notified when other users make changes?