What little tweaks do you do to your bike on race-day?
Obviously I take off the mudguards and the Barbie glitter tassels...
...less obviously I'll remove the valve caps and nuts for fast tyre changes. Normally I run with both as the nuts make for fewer valvicide punctures and the caps are just clean.
I'll also adjust the QRs. Normally I run those tight-as-you-like and parallel to the fork and chainstay for neatness and security, but for a race they're a tad looser and both pointed back and horizontal for really easy QR'ing.