There is a comic and game store close to my house that hosts a monthly LAN party. It actually draws a huge crowd. You have to sign up in advance and if you are not quick you are likely to loose out.
I have been at least a dozen times. I usually play Counter Strike or Half Life 2. I am mostly oriented towards first person shooters. Some of the other guys like Starcraft and other strategy games and some people go for RPGs. They keep a pretty good mix of games going but mostly it is just fun to hang out.