Five months into sobriety I went to a four-day music camping festival. It solidified for me that 1) It was always about the music, 2) I don't need substances to have energy, in fact, I had a lot more energy and stamina without them, 3) Most people are not paying attention and could care less whether I was drinking, getting high, or not, 4) My exit plan was to find space or leave if necessary. I did move away from some annoyingly high/drunk crowds, but in general I noticed that lots of people were NOT getting drunk or high, 5) Low and behold, lots of venues have a sober table where they are there to talk, create support, provide solidarity, and maybe give you some candy.
If it's too soon it's too soon and you're not confident you can deal, then don't go. If you're really not into music don't go to a show. I will never give up live music, and I love going to shows clear and energized.