Rebecca,
where is the event you're shooting? I know most of the indoor facilities in Florida.

Unless the zooms are F2.8, they probably aren't going to be much help. Most events do not allow flash but for demo purposes and publicity, they may make an exception. I'd ask the chairman.

As for the rest, you'll probably be at ISO 3200 (at least) and depending on how you shoot action -- whether you shoot bursts and follow it or try to capture it at a particular moment -- you'll either be shooting jpeg or RAW. The advantage to shooting RAW is that you can fix white balance in PP. If you're in jpeg, be sure to set custom white balance.

If I know the particular venue, I may be able to help with the white balance issue.

Jim