Cursing, I slapped my leg and stared at the man who killed me. He grinned back.
We we both participating in New Jersey's first GNU/Linux LAN party. The games were free software and ran on GNU/Linux. The people were mostly geeks, mostly young, and entirely cool. The fear was that technical problems would kill the party; the reality was 12 hours of non-stop gaming.
Organizing a LAN party is mostly an exercise in common sense, but adding free software to the mix adds a few wrinkles and removes some others -- for example, you won't be worrying about cracking copy prevention schemes.