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To make changes to the calendar, press the Google Calendar button at the bottom right of the calendar above and sign in as:
jnullspace@gmail.com
You can subscribe to these calendars in iCal by using the iCal menu item Calendar→Subscribe and entering the following:
GRU Calendar:
http://www.google.com/calendar/ical/jnullspace@gmail.com/public/basic.ics
CBS Seminar:
http://www.google.com/calendar/ical/bm9ioeurp9p3mii15hn5spsrhk%40group.calendar.google.com/public/basic.ics
DJC:
http://www.google.com/calendar/ical/4vjop8gu2sil0es4rtdvvouji8%40group.calendar.google.com/public/basic.ics
This will give you read-only access to the calendar in iCal.