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from the Artist: Unisex T-Shirt. Looking for Bicycle Day t-shirts? Celebrate the day Albert Hofmann first Llysergic acid diethylamide (LSD) trip! We have all kind of gifts and merchandise too, buy it here today! FAQ 1. When is Bicycle Day? Bicycle Day is celebrated on April 19, remembering April 19 1943, a historical day Dr. Albert Hofmann first took LSD intentionally.