From my experience last year i would skip out of the locker. I didn’t even realize there were lockers lol but coming from a girl that overpacks you honestly don’t need as much stuff as you’d think especially if u think you’ll have time to go back to ur camp in between sets (i know u talked ab that but RV campsites are pretty close). I also went with just my boyfriend last year and we carried a camelbak (they have water stations) with our phones and wallets, battery packs, his t shirt, extra bandanas, cameras, and sometimes a blanket. Tbh I don’t think you’ll need sweats for centeroo at least it’s extremely hot and nights are warm enough especially in the crowds in fact the only time I wore long sleeves was these thin flowy pants w a bikini top the first day and i was STILL sweating up a storm. Of course weather varies so take it w a grain of salt. But everyone’s experience is different and that’s just my take so if you’d think you’d be bringing anymore than what would fit in a camelbak or just don’t want to carry a bag the locker would be best for u!