Pack some flats
It's likely that your footwear is going to be totally kick-ass the night before and a complete nightmare in the harsh light of day.
Your favourite heels might be a great idea for showing off those fabulous pins on the dancefloor but packing a spare pair of flats in your bag is an even better one. Those black flatpack fabric things that your mum gave you once upon a time will come in handy; transforming your outfit into something 10 times more appropriate.
You will of course be left carrying your heels which will be an instant giveaway but who cares? At least you'll be able to walk straight-ish.