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Just about everything.

First of all, make sure your team has safety goggles for everyone. Either make it a responsibility of the individual members, or buy them as a team, but DON'T show up at the competition without them.

You'll want most of your hand tools (screwdrivers, wrenches, sockets, allen wrenches, etc…), a drill, screwdriver bits and nut drivers (if you have them), and all of your remaining kit parts. You've already got some crates in which to transport them. Even if you don't use them, there's a good chance another team will need a spare or an extra, and you can provide one for them if you're not using it already.

Bring extra bolts and nuts. Especially the size you only use about fifteen of, since you've probably got a few hundred extra 1/4-20 bolts.

As has been mentioned, don't forget the zip ties. Also remember to bring wire, electrical tape and crimp terminals. The inspectors may want you to insulate an exposed contact or something, and it's nice if you don't have to borrow some like I did in our rookie year.

I believe you're supposed to have a first-aid kit in the pit, and you should stock up on adhesive bandages too.

You'll also want a way to store tools while in your pit, so think about that too. The pit dimensions should be in the "At the Events" manual, but I can't find them at the moment.