There should be no restriction to the number of crews. As long as it's semi-regional, crews are fun as hell. And GUNPUNCH! is going to destroy any and all other crews anyway, so it's not like we have to worry about ties.
Sui, this is your first tournament, everyone will be willing to help in any way possible. But, really, tournaments are much more chill than you think. Don't worry about it so much.
We may need a megaphone or someone with a loud mouth to announce matches. Either that or we should go to meijer or something to buy huge sheets of paper to create a giant bracket (instead of a small tio laptop screen), much like the Japanese did in BYOC Japan. We could also use said giant sheets of paper to: designate which house is Steve's, rule rooms off limits by posting signs with the paper, and draw funny pictures of Sliq when he isn't looking. Yes? No?