Thousands of marijuana enthusiasts are converging upon Denver's Civic Center Park for an event that has come to symbolize Colorado's burgeoning claim as the nation's cannabis capital.
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.
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