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there are pot festivals, and there's the annual 4/20 celebration in denver. colorado's voters unleashed a wave of pot tourism when they legalized marijuana. this weekend saw two days of nonstop smoking and partying leading up to today, this unofficial counterculture holiday, linked to the date 4/20, april 20th, a long-time reference to marijuana. so we sent ana cabrera there. she's been out with some of these festival goers. i'm just going to let you take it away ana. you tell me what you're seeing. >> reporter: oh brooke. this is officially called the cannabis cup here in colorado which is ground zero of this marijuana legalization movement. we're literally seeing tens of thousands of marijuana enthusiasts here mingling with hundreds of cannabis companies that have converged from all around the country. they are marketing their pot