First rock concert ideas?

I'm going to my first concert September 5th. I'm going with about 9 friends and we are sophomores in highschool. The bands are Escape the Fate, Bullet for my Valentine, Seether, Three Days Grace, and ending the night is Avenged Sevenfold. I'm really looking forward to this concert and I want to know what's fun to do at rock concerts, my friends and I have lawn tickets so we are in a open grass area.