Bicycle Day

Bicycle Day is an unofficial celebration on April 19 of the psychedelic revolution and the first psychedelic trip on LSD by Albert Hofmann in 1943, in tandem with his bicycle ride home from Sandoz Labs. It is commonly celebrated by ingesting psychedelics and riding a bike, sometimes in a parade, and often with psychedelic-themed festivities. The holiday was first named and declared in 1985 by Thomas Roberts, a psychology professor at Northern Illinois University, but has likely been celebrated by psychedelic enthusiasts since the beginning of the psychedelic era, and celebrated in popular culture since at least 2004.