How to add your university timetable to iCal?
Some schools provide CalDAV links or iCal subscriptions for their events calendars.   Often this will show up as an RSS feed link somewhere on the page that contains the calendar.

You may need to ask this question of the Technology Department folks or whomever manages the events calendar.

Also, if you need to provide access credentials in order to get to the calendar, expect to run into some problems. iCal doesn't know how to do this.