Hash Bash is an annual event held in Ann Arbor, Michigan, on the first Saturday of April. The event is a protest against marijuana prohibition and celebrates cannabis culture. The first Hash Bash was held in 1972, and it has been held every year since then, except for 1977.
Hash Bash is one of the largest annual marijuana-related events in the world. In 2019, over 10,000 people attended the event. Hash Bash has been a major force in the movement to legalize marijuana. The event has helped to raise awareness of the issue and has put pressure on politicians to change their stance on marijuana.