Ah, local *Cons can be fun.
Phoenix has the DEVASTATION event once a year, which we participated in last year. They did again this year, but I wasn't there for that. They gave us the space/power/internet free, and in return we provided free internet access and registration, and ran a Quake Live tournament. It was ok, figure it cost us about $2000 in terms of manpower and lost revenue at the store from reduced capacity.
I heard this year they took the entire store there and set it up, or something close, for a full 4 days. Which is nuts to me. At that point, the event needs to start compensating me for the service I'm providing. Yea I'm getting some good marketing, but still.