As the capital of Colorado, a state leading the way on marijuana law reform, Denver was bound to be an epicenter of weed-centric activity on 4/20. And, indeed, the Mile High City lived up to its name, hosting a series of events ranging from the Cannabis Cup to rallies to concerts. Photographer Chip Kalback was there to document the festivities.
Curious consumers check out a kiosk at the annual 4/20 rally in downtown Denver.
Organizers of the 4/20 rally estimated that as many as 80,000 people attended the free event.
Since declaring recreational marijuana legal, Colorado has became a go-to destination for marijuana tourists.
While it's still technically illegal to smoke pot in public in Colorado, the authorities seemed to conveniently overlook that fact on 4/20.
The new marijuana laws allow Colorado state residents to grow as many as six plants in their homes.
In addition to the 4/20 rally, Denver hosted trade shows and events geared towards policy wonks, marijuana entrepreneurs and comedy fans.
Despite its prevalance, marijuana can still only legally be sold in Colorado by approved medical marijuana dispensaries.
Colorado residents can buy up to an ounce of marijuana per visit to a licensed retailer.
Snoop Dogg headlined "Snoop's Wellness Retreat" at the Red Rocks Amphitheatre, located in Morrison, Colorado.