The True Origin of 420
In fall 1971, five students at San Rafael High School in Marin County, California -- Steve Capper, Dave Reddix, Jeffrey Noel, Larry Schwartz, and Mark Gravich -- called themselves "the Waldos" because they hung out by a wall. They agreed to meet at 4:20 PM at the Louis Pasteur statue to search for an abandoned cannabis crop based on a treasure map. They never found it, but "420" became their code for everything cannabis.
The Grateful Dead Connection
Mark's father helped the Grateful Dead with real estate. Dave's brother was close with bassist Phil Lesh. The Waldos had all-access passes to Dead shows and parties, spreading "420" through the touring Deadhead community. In the early 1990s, Steve Bloom of High Times magazine received a flier at a Dead show in Oakland explaining the term. High Times published it, and April 20th became a global cannabis holiday.
Major 420 Events
Mile High 420 Festival (Denver): 50,000+ attendees, hosted by Tommy Chong. SweetWater 420 Fest (Atlanta): Multi-day music festival, 40,000+ attendees. National Cannabis Festival (DC): Music, advocacy, education at RFK Stadium. The Emerald Cup (California): The "Oscars of Cannabis." Hippie Hill (San Francisco): Decades-old tradition at Golden Gate Park. See our Events page for the full 2026 lineup.
Cannabis in Music, Film & Art
Music: Louis Armstrong, Bob Marley, Grateful Dead, Snoop Dogg, Cypress Hill, Wiz Khalifa. Film: Up in Smoke (1978), Half Baked (1998), Harold & Kumar (2004), Pineapple Express (2008). See our 22 Best Stoner Movies + Strain Pairings for the complete ranked list with terpene-matched recommendations for each film. Celebrity brands: Jay-Z (Monogram), Seth Rogen (Houseplant), Snoop (Death Row Cannabis), Willie Nelson (Willie's Reserve), Mike Tyson (Tyson 2.0).
The Legalization Movement
24+ states have legalized recreational cannabis. Key organizations: NORML (since 1970), Marijuana Policy Project, Last Prisoner Project (freeing those incarcerated for cannabis). Federal rescheduling is in progress. The SAFE Banking Act would resolve industry banking issues. Multiple states have 2026 ballot initiatives.
Beyond 4/20: The Full Cannabis Calendar
April 20 is the most famous cannabis holiday, but it's not the only one. Bob Marley Day (Feb 6), Willie Nelson's birthday (Apr 29), Jack Herer Day (Jun 18), 7/10 Dab Day (Jul 10), National CBD Day (Aug 8), Snoop Dogg's birthday (Oct 20), Green Wednesday (the Wednesday before Thanksgiving), and Winter Solstice — see our Complete Cannabis Holidays Calendar 2026 for every weed holiday with dates, history, and how to celebrate. The two cannabis sales days that rival 4/20 in commercial volume: 7/10 Dab Day (concentrate sales) and Green Wednesday (the biggest single sales day of the year).
Ready to celebrate? Check out our Events page or Cleveland 420 for local events.
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