Multiple reports have begun trickling in that the California Supreme Court will hand down its decision on Proposition 8. Also, barricades have begun appearing in San Francisco's Castro neighborhood, and around the Supreme Court building. It has also been reported that the SFPD and San Diego police departments have been alerted to the rulings.

We should know sometime this morning PDT.

That said, groups have been preparing for reaction to the announcement, whatever it might be.

Check Day of Decision for demonstration events near you. List of Cities.

LOS ANGELES: Rally and March starting in West Hollywood. When: 7:00 pm on Decision Day / March starts ~ 8 pm, Where: Santa Monica Blvd & San Vicente Blvd, What to bring: * White Ribbon to tie White Knots all along our march, * White Flowers to lay in Matthew Shepard Human Rights Park, * White Chalk to write messages in the road and on the sidewalks, * Wear White to show our unity in supporting same-sex marriage, * Bring signs and bullhorns and anything else to make noise…let them hear us united and strong.

You can also meet the march at approximately 9:30pm at Hollywood & Highland, Rally at the L.A. County Marriage License Office, When: 12:00 pm to 3:00 pm on Decision Day, Where: 4716 East Ceasar Chavez Avenue, L.A., CA 90022

In NEW YORK: "New Yorkers will be meeting at 6 PM on Thursday, May 21st (should the decision be handed down) at Sheridan Square in Greenwich Village (Christopher Street and Seventh Avenue South) to either protest or celebrate the decision and continue to call for the New York State Senate to pass marriage equality before the end of this legislative session in June. We will meet at Sheridan Square and march to southern steps of Union Square for a rally. We will stand in solidarity with our brothers and sisters in California and continue to draw attention to the fact that marriage equality should be passed in the Empire State."

New York Facebook page.