depends on who you're with. they're all good fun and pretty casual. i went to a toga party once. all my friends are comp sci nerds with little to no social skills, so it was kindof painful. we got there too early too, it said it started at 8 so we went after our lectures that finished at 8. it didnt really get going till 10 though, and i was more than tipsy by then
there was this godawful excuse for a dj, dj boo. she was playing like garth brooks and dire straights. theres no public transport from uni to my house, unless i go on some 2 hour death commute, so i dont go much after hours.
go with friends and its a good time. im a fan of beer bingo as well, thats on about 5pm some nights.