Some events we have are paintball, going to a hockey game, go karts, a dry rush party, etc. our rush is long, 7 weeks, so we have to keep the freshmen occupied. Also, we just hang out with them and do things we do together, movies, bowling, basketball, and other stuff like that. the thing that sucks is that there isn't much to do in town.
Hope you didn't think I was giving you a hard time, above!
I think that Corbin has some great suggestions. They're activities where guys can be themselves, hang out, and just have fun. They take the emphasis off of drinking, drinking, drinking, and more on sports, having fun, getting to know each other and forging friendships, etc.
Can you rent some tables from an entertainment companies that would provide tables like table soccer, or air hockey, that kind of thing to have in the house, just for a week or so.