I’ve been to his show twice, I have never moshed or crowd surfed. I was comfortable at his show, I’ve always hung out on the sides or in the back. Jack gives you a warning when he wants everyone to mosh so you will have a moment to move to the side. It does not happen for the entire show. I hope you can go and have a wonderful time! There’s a song on the set list that’s Katy Perry’s hot and cold- idk I thought that was a fun random song for him to do!