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The Colorado Cannabis Convention, sprawled out over 200,000 square feet in the Colorado Convention Center and boasted as the largest Cannabis Convention in the country, was held April 2-3, 2010 in Denver, Colorado..Founder and publisher of KUSH Magazine, Michael Lerner, pumps up a crowd of convention attendees with prizes, mostly donated from the over 300 business that purchased convention booths, April 3, 2010.