I get goosebumps just thinking about that!! How incredible that must've felt!
I looked behind me when I saw the Chems play Coachella last time. I was quite close to the stage, about 5 rows deep give or take, at any given moment. There weren't 50,000 people in the tent, but it sure felt like there was when I looked behind me and saw a fleshy kelp forest of outstetched arms waving in the air!!