I have a suggestion for the Lanfest...
A Game called 1nsane.
Its 10 years old, but still looks cool and will DEFINATELY run on everyone's PCs
Its a Free roaming Multiplayer Off Road Racing game, modes uinclude Racing, Free Roam, Return the Flag, King of the Hill, Capture the Flag, & some others I can't remember.
Invictus (the company that made it) released a no-cd patch for it IIRC so everyone can have it permenantly from my Install Disc.
There should be a huge list of Additional Vehicles/Maps/skins avaliable for the Game (Including one called FUBARville which was one of the first user created maps avaliable for the game... wonder how that got its name
) provided that the website is still running, i'll have to look at home, if not I might have some saved somewhere (loads of Yanks to smash up) i'll have a look, but its still a great game.
This game is FUN, pure & simple. Oh and the cars are fully deformable too which can be interesting