Oh well at that point you post up your own craigslist or forum ad.
"Yo going to AWA, have 3 people need X amount of people to stay in room and split cost... Anime Trivia wars will be had for spots on the bed. Losers get floor, everyone saves money. Alcohol is appreciated."
That is unless you're one of those people who is morally opposed to a tasty alcoholic beverage.