We went to Re-Con last time.
It's really not all that overwhelming but try to find someone who doesn't like sushi and give them a pound to go get a portion of the free sushi.
Tell them to tell the guy when he asks them what they want, they have to say "Well, first time for everything. Surprise me!" and you end up with like two portions.
Oh, and if you stand at the door long enough looking like an idiot, you'll get handed a second raffle ticket. This one was purely accidental.
Be sure to take pictures.
My name is the Osakan one and I approve of this message.
</douchetude.