Critical Mass is always a good time. I've been slowly upgrading my bike bit by bit since the start of the summer and haven't had a chance to take it to critical mass yet. I'd say about half the bikes I see people actually riding on campus are fixed gears or ss freewheels. Seems that Bianchi has garnered a good deal of the marketshare around here. I live over on Como Avenue just off campus and my roommate and I go on pretty long bike rides fairly often. We had quite the adventure last Thursday. I'm a recent freewheel convert and am looking to buy a fixie when I get the cash. The bike culture is what you make of it. If you're proactive about it you can find quite a bit going on. If you don't look very hard it may not seem like there's anything going on. I know I didn't really do much outside of critical mass before I became interested in fixies. Get on the listserv for critical mass and you'll get a little bit of info about the goings on. I'd check in at some bike shops to see what things they might know about if you really want to get active. Good luck with the move.