Exfoliate! This could very well be the most important part of you pre prom preparation (ok after buying the dress and planning prom out, but you know what I am saying). Make sure you remember to exfoliate the night before. No one like unexpected zips popping up the day of the big event. My tree favorite exfoliating scrubs are as follows (in no particular order):
Ocean Salt Cleanser by LUSH
Dermalogica Daily Microfoliant 
$18
