The stoners among you will recognize that, being 4/20 in American date notation, it’s also a day to celebrate smoking weed, since “420” is American argot for marijuana. Why? Here’s why:
In 1971, five high school students in San Rafael, California, used the term “4:20” in connection with a plan to search for an abandoned cannabis crop, based on a treasure map made by the grower. Calling themselves the Waldos, because their typical hang-out spot “was a wall outside the school”, the five students — Steve Capper, Dave Reddix, Jeffrey Noel, Larry Schwartz, and Mark Gravich —designated the Louis Pasteur statue on the grounds of San Rafael High School as their meeting place, and 4:20 pm as their meeting time. The Waldos referred to this plan with the phrase “4:20 Louis”. After several failed attempts to find the crop, the group eventually shortened their phrase to “4:20”, which ultimately evolved into a code-word the teens used to refer to consuming cannabis.