Denver's annual April 20th pro-marijuana smoke-out -- known as the 420 Rally -- is reputedly the largest of its kind in the world on a day that has come to be regarded as a ganja holiday. Organizers expect the rally to draw tens of thousands of people, though police have generally estimated past rallies at fewer than 10,000 participants. A similar, slightly smaller event is expected to take place on the University of Colorado campus in Boulder.
huffingtonpost.com
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