After teasing a return, Mayhem Fest is back, but as a single-day fall festival rather than a summer festival tour. The full lineup has been revealed, packed mostly with hard-hitting 21st century acts and headliners Bad Omens. The 24-band fest is largely a who’s who of metalcore, past and present, with Parkway Drive and Architects also billed near the top. See all the details about this year’s Mayhem Festival below. When + Where Is Mayhem Fest 2024?Mayhem Fest will be held on Oct. 12 at the Glen Helen Amphitheater in San Bernardino, California. Who Is Playing Mayhem Fest 2024?The full Mayhem Fe…