Pack some nice clothes you enjoy wearing for UB. Chances are, you'll be in a hotel before and after the Derby and will probably be able to leave your luggage in their safe storage.
Another change of clothes for your return to civilisation is a good idea too. You'll appreciate these for both press conferences and parties and for the sheer joy of getting clean again.
We'll go out for a slap-up meal before travelling to the start line. There is clubbing and posing galore in UB, so dress up if you feel like it.