Talent showcase (already suggested). Music jamming sessions, art sessions. It would be cool if people skilled in certain fields could actually run workshops to teach some basic skills to everyone else. Social events are probably a good idea, as mentioned. Aside from a "Singles Ball" - perhaps a games night or something similar (ideally family friendly, singles friendly, and couples friendly)? Another idea could be organized voluntary excursions - we did those for O'Week in college and they worked out really well. Like, everyone who was interested could go to see a particular attraction, or go to the beach/ice-skating/something.
If we were all in LA it would be nice to organize to go visit the local attractions and that sort of thing.
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Into the dark...