I honestly don't even know how to go to a convention. First/last one I was at was a frickin' bridal convention. Do you pay to get in and wander aimlessly?
Go to the Sharonville convention center, drop 15$ and then it's all open gaming. They have a good library, borrow a game, and people will come over.
It's actually a really nice venue. I'm pleasantly surprised. I have 6 guys in my squad so if you come tomorrow (9a-5p) let me know and you have built in people to play with. Cool, laid back non-douches.