Gay activists in California are planning a massive show of force as the question of gay marriage returns to the state Supreme Court.

On Thursday, the court is set to hear oral arguments in a lawsuit that argues that Proposition 8, the ballot initiative that yanked back the right of gay and lesbian couples to marry in the state, is an illegal constitutional revision and should be invalidated. (Read more about the case here.)

Arguing for repeal will be Shannon Minter, legal director of the National Center for Lesbian Rights in San Francisco. Minter, a transgender man now married to a woman, successfully argued last May's state Supreme Court case that ushered in gay marriage in the Golden State, a ruling that Proposition 8 reversed.

Supporting the measure is Ken Starr, the dean of Pepperdine University School of Law. Starr is best know as the independent counsel who investigated President Bill Clinton in the Whitewater affair, which led to the impeachment of Clinton in the House. The Senate, however, acquitted him.

Equality California has organized no less than 17 demonstrations on Wednesday in support of invalidating the gay marriage ban. The event, called the Eve of Justice, combines many of the activities seen in previous demonstrations such as marches, recommittment ceremonies, candlelight vigils and moments of silence.

A large gathering is expected on Thursday at the court's San Francisco headquarters where justices will hear the case. Outside, a jumbotron screen will feature Starr and Minter as they present their arguments live.

Here is a list of planned events as of Monday night.

Bakersfield: Gather at the south end of Cecil Avenue Park at 4PM and at Circle Park at 5PM.

Costa Mesa: Gather at the Fairview Community Church, 2525 Fairview Road, at 5:30PM.

Fort Bragg: Gather at Town Hall at 4PM.

Fresno: Gather at the Fresno County Clerk's Office, 2221 Kern Street, at 6PM.

Los Angeles: Gather downtown at Olvera Street at 5:30PM for a vigil that ends at the CA Supreme Court for a moment of silence at 8PM.

Modesto: Gather downtown at 1010 10th Street at 7PM for a vigil that ends at the Court House for a moment of silence at 7:30PM.

Napa: Gather at the United Methodist Church, 625 Randolph Street, at 5:30PM.

Palm Springs: Gather at Riverside County Courthouse, Tahquitz Canyon Drive and El Cielo Road, at 4PM.

Riverside: Gather at City Hall at 7PM.

Roseville: Gather at the Roseville Galleria Mall near the Cheesecake Factory, 1151 Galleria Blvd., at 6PM.

Sacramento: Gather at the Capital at 5PM for a vigil that ends at the CA Supreme Court.

San Diego: Gather at the Hall of Justice, 330 W. Broadway, at 4PM for a downtown vigil.

San Francisco: Gather at Market and Castro at 5PM for a vigil that ends at the CA Supreme Court.

San Jose: Gather near the Valley Fair shopping center, Winchester Boulevard and Stevens Creek Boulevard, at 6:30PM.

San Luis Obispo: Gather at the Downtown Center, 888 Marsh Street, at 5:30PM.

Stockton: Gather at the First Unitarian Church, 2737 Pacific Ave., at 6PM.

Visalia: Gather at the Courthouse lawn, 221 S. Mooney Blvd., at 5:30PM.

These events are co-sponsored by Marriage Equality USA, Human Rights Campaign, Join the Impact, GLAAD, PFLAG, COLAGE, Courage Campaign, California Faith for Equality, Progressive Jewish Alliance, Unitarian Universalist Legislative Ministry California, Amnesty International and GSA Network.

Please check the event's website for additional information, last minute updates and additions at