Hey Ninja Bunny,
Hope you're feeling better.
Anyway, 33Girl has the right idea. If I remember correctly, Cal is a semi-Anti-greek campus and not alot of people wear letters on campus. Since I'm not on the CAL campus I don't know where the greeks hang out except their houses, but look for fliers around campus (Sproul plaza is good)announcing events and check the Daily Californian(campus paper)also. You might also want to contact the Greek affairs office on campus. I quite certain they post announcements and related things there.
I'm glad you're going to wait. As I said before CAL is crazy enough and I'm sure you've already figured that out! Just wait until the Big Game! Stanford Sucks! Go Bears!
X Girl