The movie "Milk" is about former San Francisco Supervisor Harvey Milk, the first openly gay elected city official, who was fatally shot along with then-Mayor George Moscone in 1978.
The 51 screenings will take place in 39 communities and more than 10 Bay Area cities. The screenings follow a hearing Friday in the California Supreme Court in which the sponsors of Proposition 8 urged the court to uphold the measure that voters passed Nov. 4.
The proposition overturned the state Supreme Court's May ruling to allow same-sex marriages in California.
The high court is considering three lawsuits in which several same-sex couples and a coalition of cities and counties claim the measure should be struck down because it is a constitutional revision rather than an amendment. A revision requires approval of two-thirds of the Legislature as well as a majority of voters.
The court has said it could hold a hearing in the case as early as March. Its ruling will be due 90 days later.
Today's screenings will take place at various movie theaters and other locations, including four in San Francisco.
Following many of the screenings, viewers can then attend "Light Up the Night," the nationwide candlelit vigil organized by Join the Impact, a group that encourages equality for all, to draw attention to the some 18,000 same-sex couples who were married in California before Proposition 8 passed.
A complete list of the screenings can be found at www.couragecampaign.org/MILKplusLOVElocations.