the first order of business is to ignore the naysayers who insist you should switch to CD mixing. i've been bringing vinyl out to the playa for several years now and i've never damaged even one record. you just have to pay *really* close attention to your wax.
this bit from the thread linked earlier is good advice:
a) Keep your records in the shade at all times! I've kept mine on our school bus or any shady, ventilated area and it works fine. Don't keep them in a car or enclosed area where the temps can get quite hot.
b) Put your records back in the sleeve immediately after playing them and ONLY bring them out when/where you know you'll be playing them. Keeping them in their bags at all times will save a lot of wear and tear.
the other trick i've learned is to pack your record bag super full so that there's no room for the records to get misshapen. supplement the ends of your crate/box with the cardboard squares you get when you order records in the mail if you can't pack it full enough. in my experience, having all those records crammed in so tightly means there's not enough space for them to get deformed.
bring an extra can of gruv glide (or whatever vinyl treatment you prefer) and a stockpile of those round puffy applicator pads. clean up after yourself. stash your records somewhere cool and safe. if you do all this you'll be fine bringing out your records, and i'll respect you more in the morning than if you had played CDs