Save your best for the race. Don't wait until the night before the race to install that new chain or whatever. Just stuff them in your jersey pockets.
Funny things happen during races.
Camelbaks work great in races. Two hours before start time isn't too far ahead. You don't want to be rushing around just trying to get to the start line. You probably won't win, so don't worry too much about your start position. Just try to line up in the middle somewhere.