Holy crap, nothing like waiting until the last second!
Have you already got your race license, or are you taking a class the day before?
Do your numbers meet the requirements of the racing org (hopefully your number plate already has a yellow background)? Does the racing org require your number to be on your helmet as well? If you don't have a race license, do you have a way to make or buy whatever race number you get?
Post up which race org you are planning to race with, as HondaGalToo already mentioned, and we will try to help you out.
I sincerely hope you have the time this week to properly prepare your bike to meet the racing requirements of whatever org you are going with. Race prep is not something to be just thrown together at the last second.