Funny story about drugs actually... last year some people I know bought acid that was on a ritz cracker. Most of them took it before they went in, but one of the kids just put it in his pocket, wrapped in tin foil. Going into the venue, the security guard asked to see what was in his pockets, and he pulled out the aluminum foil. The guard opened it and saw the one single ritz, and the kid said "I'm hungry" and grabbed it back, and got away with it haha.
I think it would be impossible not to have a good time. It was the best weekend of my life. Just go into it with an open mind, be willing to see new bands, get pushed around by the crowd, and try new things. Also maybe figure out a way in advance on how to bring stuff into the concert (food, clothes, other things). It's really annoying to wear a backpack, but sucks to not have any other clothes or food or water. I'm honestly thinking about bringing a fanny pack, fuck yeah.