The Mile High 420 Festival returns to Civic Center Park on Monday, April 20. We’re aiming to raise $20,000 by April 26. Your support ensures Westword can continue watching out for you and our community. No paywall. Always accessible. Daily online and weekly in print. Progress to goal $20,000 The Mile High City always lives up to its name on 4/20, from a massive annual smokeout to cannabis-friendly parties and licensed consumption venues in Denver.