Actually, it might be better to just ask Megacon staff for a spare panel room or something to host it in. OCCC staff gets pretty irate when it comes to people using the outlets without permission. Hell, I think you have to ask for a log-in to access their wireless signal too, though that might've changed.
It's best to ask ahead before you bring all the equipment(flatscreen, pads, console, games, etc.)and have to bring it all back to your car or hotel. Which is a long walk either way...
"Then what am I supposed to believe in? What am I going to leave behind when I'm through?"
-Raiden, Metal Gear Solid 2: Sons of Liberty