Every year on April 20th (4/20), cannabis lovers celebrate their favorite plant with festivals, protests, marches, and smoke-outs great and small. So what are the grassroots origins of this high holiday? And how did it spread around the world? PATREON Please support Great Moments in Weed HIstory on Patreon. Supporters get exclusive access to video shows and seshes, plus access to cool rewards like a signed book or signature lighter. And it truly helps us make the best show possible.