Rockstar Energy Drink Mayhem Festival July 17th, 2012 Bonner Springs, Kansas Sandstone Amphitheater Slipknot, Slayer, Motorhead, As I Lay Dying, Anthrax, The Devil Wears Prada, Asking Alexandria, Whitechapel, Dirtfedd, Betraying the Martyrs, Upon a Burning Body, I the Breather Anyone attending the 2012 Rock Star Energy Drink Mayhem Festival was