MIT Linguistics now has a unified events calendar.
View from browser:
http://www.google.com/calendar/embed?src=mitlingevents%40gmail.com&ctz=America/New_York
subscribe via iCal and similar programs:
http://www.google.com/calendar/ical/mitlingevents%40gmail.com/public/basic.ics
XML via newsreader:
http://www.google.com/calendar/feeds/mitlingevents%40gmail.com/public/basic
MIT students, faculty and staff can add events to the calendar (contact David if you’ve lost the e-mail with the password), but anyone can read it.