2015’s edition of the Rockstar Energy Drinks Mayhem Festival took over San Manuel Amphitheater in San Bernardino, CA on Saturday, June 27th, opening the six week summer metal camp in Southern California, home to festival headliners Slayer. Although two stages smaller this year, Mayhem still included a packed lineup on both the main stage and the Victory Records stage including bands such as King Diamond, Hellyeah, Jungle Rot, Whitechapel, Sister Sin and more. Take a look at the gallery from the inaugural stop of Mayhemfest 2015. The tour will be winding its way around the States (with a stop in Canada) until August 2nd. You can see if the festival is hitting your town here.