TIP 3: What to wear? Girls, I highly advise to wear minimal makeup. You are going to sweat, and it will smear. I've seen it happen. It's not pretty. As far as clothes go, I advise on wearing some kind of bathing suit, under shorts and a tank top. For guys, swim trunks and a tank top is just fine! Also, be sure to wear comfortable, closed-toe shoes.
TIP 4: What to bring? BRING MONEY! There will be merch that you will want to buy, so bring plenty of money. Also, bring a lightweight draw-string bag to carry on your back. You can put your camera, water bottle, clothes, and the other merch that you buy. Draw-string bags come in handy!
TIP 5: As soon as doors open, find the inflatable that tells when each band is playing. Make a schedule. Try taking a picture of the inflatable, that way you won't be standing there too long, with everyone else. While figuring out who you're going to see, go check out at least one band you don't know. You might just get a new favorite!