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Fri, Apr 19


Grand Army Plaza + Prospect Park

Bicycle Day 2024

Join us for a bike ride & picnic celebrating the 81st anniversary of the world’s first LSD trip.

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Bicycle Day 2024
Bicycle Day 2024

Time & Location

Apr 19, 2024, 5:00 PM – 9:00 PM

Grand Army Plaza + Prospect Park, Flatbush Ave, Brooklyn, NY 11238, USA


About the event

Join us on April 19th for a bike ride followed by a picnic at Prospect Park, celebrating the legacy of Albert Hofmann and the 81st anniversary of the world’s first LSD trip.


  • 5pm - Meet at Grand Army Plaza.
  • 5:15pm - Depart for one loop ride around Prospect Park
  • 6pm - Picnic in Long Meadow North of Prospect Park (BYO food & drink)

For best results, please arrive to Grand Army Plaza early so that we can begin the ride promptly.

The picnic is BYO, so please feel free to bring your favorite snacks and/or beverages.

Not into biking? Please join us anyway and help our team set up the picnic while others are riding!


A little history on Bicycle Day: On April 19, 1943, Swiss chemist Albert Hofmann intentionally ingested 0.25 milligrams of lysergic acid diethylamide (LSD). Less than one hour later, Hofmann experienced sudden and intense changes in perception. He asked his laboratory assistant, Susi Ramstein (the first woman to take LSD), to escort him home by bicycle. On the way, Hofmann's condition rapidly deteriorated as he struggled with alternating feelings of anxiety, that he was going insane, and that the LSD had poisoned him. Soon after, his terror began to give way to a sense of good fortune and enjoyment. Thus marking the most notable bike ride in history. The observance was first celebrated in DeKalb, Illinois in 1985 and, over the years, grew into a widely celebrated event.

We can't wait to celebrate with you! 🚲

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