So I just realized I instinctively put "house party" in the title,when I really meant "party at my house" which is actually an apartment. Albeit a big apartment, but an apartment nonetheless.
Our neighbors throw similarly sized parties almost every other weekend, with tons of drunk chicks yelling like banshees out on the front porch, and they've never had the cops called, so im not too worried about that, I am def gonna be knocking on all of my neighbors doors to give them my contact info, etc. tho just in case.
Also, my roommate owns a pretty sizeable keg and bucket, but its missing the pump thing, anyone know how much one of those runs for and where to get it?
Sure... make sure and invite your next-door neighbors and you should be cool.
You can rent the tap from the liquor store when you get the keg. With 100 people you probably need 2 kegs (Bud Light/Miller Lite, etc) unless it's a quick party. We would charge people $3 for a red solo cup (unlimited beer from the keg) and if they wanted to drink anything else we told them BYOB. Might need to be $4-5 these days. Make sure everyone knows the deal in advance on that.
I went to other parties where you'd get a cup for jungle juice, or jello shots or something, but you need a keg and a few bags of chips at the minimum. If you want to go all out you can do that too, but just stuff to munch on is good.
Make sure you have plenty of ice. I assume your roommate knows the drill if he's got a keg bucket. You and your roommates should take shifts working the keg/DJing and walking around socializing/watching to make sure shit doesn't get crazy. Have a good playlist of popular stuff queued up on a laptop hooked up to a sound system and you can add some requests. You need an area where the music is loud and people can dance/party, then some quieter areas where people can socialize, play drinking games, or whatever.
Make sure to have some other close friends who can help out if you need it (if a couple of them are big guys who can enforce, great).
Trash can in each room is a good idea and make the drunk people help you pick stuff up before they leave at the end of the night.