Users of iCal, or any program that understands the iCalendar (.ics) standard, can also subcribe to the WCDAC calendar. Dates and details do change, so be sure to set your subscription to refresh regularly (once a week is fine).

You might also be intersted in additional calendars not published by the WCDAC, such as theatrical events at Carnegie Mellon and the Carnegie Mellon academic calendar. More calendars can be found at iCalShare and Apple's calendar library.