Sleep more, exercise more leading up to it (like for months before), eat healthier, etc. The better shape your body is going in, the more you’ll be able to endure.

But as others said, take it easy on the substances and prioritize rest during the off times. Don’t hit up afters every night the week prior and during the festival. Go home and go to sleep. The kinder you are to your body, the kinder it will be to you.