Photos: Rockstar Mayhem Festival Dallas 2015 (Slayer, Hellyeah, The Devil Wears Prada, + more) Concert Photos - August 9, 2015August 9, 2015 SHARE:FacebookTwitterLinkedinTumblrPrintemailSlayer King Diamond Hellyeah The Devil Wears Prada Whitechapel Thy Art Is Murder Jungle Rot Sister Sin Sworn In Shattered Sun Follow updates from Rockstar Mayhem Festival here. Photos by Courtney Cook | @crtnyck