I just wanna relive my experience from bonnaroo 2012 to hold me over until 2013 so if you were there let me here it!!
I went 2009-2012. It is always a good time just make sure you are acclimated to the heat prior to going. Get some sleep and have a camelbak! I would spend 30-35 minutes at a time in a sauna before I went and it was wonderful.