Red Rocks Amphitheatre has seen some of the biggest smoker friendly concerts on 4/20 — the natural setting and the open air makes a comfortable venue for the occasion. But this year’s 4/20 lineup could cause the biggest cloud to form over the mountain venue. Snoop Dogg, Wiz Khalifa, YG and Smoke DZA have announced a show on the weed-themed holiday that’s been dubbed, Snoop’s 4/20 Wellness Retreat Denver.

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