Hash Bash is an annual event held in Ann Arbor, Michigan, on the first Saturday of April at high noon on the University of Michigan Diag. A collection of speeches, live music, street vending and occasional civil disobedience are centered on the goal of reforming federal, state, and local marijuana laws. The first Hash Bash was held on Saturday, April 1, 1972 in response to the March 9th 1972 decision by Michigan Supreme Court declaring unconstitutional the law used to convict cultural activist John Sinclair for possession of two marijuana joints. This action left the State of Michigan without a law prohibiting the use of marijuana until after the weekend of April 1, 1972. Chef Ra was a fixture of the Hash Bash for 19 consecutive years before his death in late 2006.
It is a huge misconception that Ann Arbor has very lenient laws regarding the possession of marijuana. Surprisingly, a lot of people are under the impression that the penalties are- $25 fine for the first offense, a $50 fine for the second offense, and a $100 fine for the third (and subsequent) offense—and is a simple civil infraction rather than a criminal offense, such as misdemeanor or felony (see Cannabis laws in Ann Arbor, Michigan). Although the city laws were more relaxed than State laws, the State law must be followed, regardless if the violation takes place on City property; thus harsher penalties than most are led to believe. Even so, the campus of the University of Michigan sits upon state property, and so anyone caught with marijuana on any campus location is subject to the more strict state marijuana laws. In addition, since state law takes precedence over municipal law, many people are prosecuted under state law regardless of where in Ann Arbor they are located. There is a separate but heavily related event following Hash Bash just off campus known as the Monroe Street Fair, where there is usually a live show accompanying the many street vendors selling extravagant bongs and other paraphernalia, along with a Michigan NORML booth.
The second annual Hash Bash, in 1973, attracted approximately 3,000 participants. That year, state representative Perry Bullard, a proponent of marijuana legalization, attended and smoked marijuana, an act which later earned him criticism from political opponents.
Hash Bash participants did not encounter significant police interference until the seventh annual event, in 1978, when local police booked, cited, photographed, and released those participants alleged to be using illegal substances.
The 2009 Hash Bash on April 4 celebrated medical marijuana's victory in Michigan and was the largest gathering that the event has seen in years, with an estimated 1600 participants – an increased turnout which the Michigan Daily attributed to the "wider acceptance of recreational drug use both on campus and across the country."
The 2010 Hash Bash on April 3 had an estimated 5000 attendees.
The 2011 Hash Bash on April 2 had an estimated 6000-6500 attendees.
 Recent and upcoming Hash Bash dates
- 2013: 42nd annual - April 6
- 2012: 41st annual - April 7
- 2011: 40th annual - April 2
- 2010: 39th annual - April 3
- 2009: 38th annual - April 4 
- 2008: 37th annual - April 5
- 2007: 36th annual - April 7
- 2006: 35th annual - April 1
- 2005: 34th annual - April 2
- 2004: 33rd annual - April 3
- 2003: 32nd annual - April 5
- Allison Pincus, "The First 'High Noon' March," Michigan Daily, 3 Apr. 2007.
- "36th Annual Ann Arbor Hash Bash" (Press release). Michigan NORML. 2007. Retrieved 2007-04-09.
- "3,000 Hold 'Hashbash' at Michigan," Chicago Tribune, 2 Apr. 1973, p. 14.
- Associated Press, "Former Ann Arbor Rep. dies at age 56," Michigan Daily, 19 Oct. 1998.
- "Around the Nation: Police Arrest Drug Users at Michigan 'Hash Bash,'" New York Times, 3 Apr. 1978, p. A14.
- Valiant Lowitz,"Hash Bash returns for another hit," Michigan Daily, 5 Apr. 2009.
- Ann Arbor Hash Bash Archive Project,","
- Ann Arbor Hash Bash Archive Project,","
- Legalization of Medicinal Marijuana in Michigan
||This article includes a list of references, but its sources remain unclear because it has insufficient inline citations. (August 2009)|
- Freedom Activist Network's Guide To Ann Arbor Hash Bash
- Monroe Street Fair official site
- "Pro-pot event gets touch of Hollywood" - Geoff Larcom for the Ann Arbor News, April 8, 2007.