Then you really need to go to one.
A little
Several years ago, my friend and I went to the bathroom at an Alanis Morissette concert and when we walked in, there was a long line and a strange smell, not a bad smell, but strange. We were both standing there sniffing going I wonder what that is. After 10 – 15 minutes in the bathroom, We walked 10-steps from the door of the bathroom, when my friend turns to me and says I don't feel right. I wasn't feeling right either, cloudy, fuzzy, floating, you name it. Come to find out, we were exposed to PCP. So, not sure how it is now, but that is one thing you really have to be careful about when going to some concerts.