Mile High 420 Festival 2024 Lineup. Scheduled for april 20 at civic center park, the mile high 420 fest includes a free concert by gucci mane, ohgeesy and others — and plenty of weed smoke. Find event and ticket information.

The mile high 4/20 festival is returning to civic center park in denver this year, but the free concert lineup is still under wraps. To join the festivities, secure your free ticket today.