Being there early is clutch....
Pick something fairly generic that most people will like, Kokanee, Bud (

), Canadian, whatever....after a while you can switch it up once you know what people want to drink.
Oh...and Cans...very important!
Everyone likes Keiths by the way...I'm not sayin' I'm just sayin'....
I'm saying FKA!! Be early, bring Keiths!!