Flatline Fest
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Flatline Fest is a two-day American music festival focused on extreme metal held at the Oriental Theater in Denver, Colorado. It will debut in 2026, and is scheduled to be held on June 13th and 14th. The event is organized by music producer Dave Otero. Acts included on the roster include Cattle Decapitation, Aborted, Archspire, the Zenith Passage, Cephalic Carnage and Allegaeon. A masked band called Nuclear Power Trio, which is rumored to contain members of Cephalic Carnage, Allegaeon, and Havok is also scheduled to play.[1][2][3][4]