Once the province of activists and stoners, the traditional pot holiday of April 20 has gone mainstream in the first state in the nation to legalize recreational marijuana. Tens of thousands gathered for a weekend of Colorado cannabis themed festivals and entertainment, from a marijuana industry expo called the Cannabis Cup at a trade center north of downtown, to 4/20 themed concerts at the legendary Red Rocks Amphitheater, acts included Slightly Stoopid and Snoop Dogg, to a massive festival at Civic Center Park, in the shadow of the state capitol, where clouds of cannabis smoke are expected to waft at 4:20 p.m. MDT Sunday. - New York Post
