Displaying your letters before the start of rush was a big no-no at my school. The only exception was for car stickers (it's hard to remove those
).
The most enjoyable work week activity I can remember was when I was a rho chi... we had a lock-in. Ice cream, lemonade, cheesy chick flicks, and for some strange reason, a lot of anime... It was a great bonding experience, especially since I was the only rho chi from my sorority - I knew a couple of the other rho chi's from Panhel and that was it.
We did have a tradition of going to IHOP after our last pref party... sort of a "thank goodness, it's over, bring on the chocolate chip pancakes" thing
The IHOP we went to isn't there any more, though...