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Outside Festival is a pioneering musical experience presented by Capital One and REI Co-op, produced by Outside Interactive, Inc. Known for blending bold, genre-spanning performances with the scenic backdrop of Civic Center Park in Denver, CO, Outside Festival has grown into a must-attend event on the summer calendar. In 2025, the festival spans May 31–June 1, with the Outside Summit kicking off May 29–30, creating a multi-day experience that pairs dynamic live sets with thoughtful programming and outdoor culture. The festival expects around 25,000 attendees for the weekend, drawing music lovers from across Colorado and beyond.