Knotfest is a music festival created by American metal band Slipknot. The inaugural Knotfest was a two-city event and took place on August 17, 2012 in Council Bluffs, Iowa and August 18, 2012 in Somerset, Wisconsin. Amongst the line up were bands such as Deftones, Lamb of God, Cannibal Corpse, and many more. On March 24, 2014, it was officially announced "Knotfest Japan" will be held in November 15 and 16 at Makuhari Messe, Tokyo. Headliners of both dates are Slipknot. Korn, Limp Bizkit, Lamb of God, Five Finger Death Punch, Papa Roach, Bring Me the Horizon, Trivium and In Flames were announced to perform. On the first date of the Mayhem Festival 2014, Knotfest 2014 was announced, with it being held at the San Manuel Amphitheater in San Bernardino, California, on October 24–26. Knotfest 2015 will be held once again at San Manuel amphitheater in San Bernardino, CA during October 23 through October 25