Comment 3 for bug 533279

The solution is not perfect, as the true event names would not be displayed. However, they will still be visible in the /topic. I guess this solution is ok as a temporary workaround, since people will at least be able to see the schedule of classroom events and use lernid with them. The icalurl for the calendar is:
http://www.google.com/calendar/ical/canonical.com_qg6t4s8i7mg8d4lgfu9f93qid4%40group.calendar.google.com/public/basic.ics

Thanks a lot Michael.