Bring earplugs of some type (foam ones from CVS, or better option = Loop Experience Earplugs on Amazon). Last year's Deadmau5 set was one of the loudest sets I've ever heard, not worth having weeks of tinnitus. It will very likely be cold outside in line then be warm inside after a few hours/sets, so maybe bring layers that are easy to tie around you etc. Outfits all over the place - full-on rave outfits, others dressed up to go out after, & all the in between, so do you & be comfortable. Bring a camelback to fill w/ water if you're taking any treats or stay hydrated w/ water bottles. Security has been lax in past years. Our group has had an incredible time the past few years there, have fun! High energy party atmosphere 100%.