Outside Days returns to Denver, Colorado from May 29-31, 2026, bringing together an impressive lineup of rock and alternative acts for three days of live music. The festival features headliners Death Cab for Cutie, My Morning Jacket, and Cage The Elephant, alongside notable performers including The Flaming Lips, Tash Sultana, Japanese Breakfast, and GROUPLOVE. With 16 artists spanning rock, alternative, emo, and indie pop genres, the festival offers a diverse mix of established acts and emerging talent. The lineup includes both American artists and international performers, with Australia's Tash Sultana adding a global flavor to the predominantly rock-focused event.