Gay rights advocates plan to hold an event Saturday in Charleston as part of a nationwide protest of California voters' decision Nov. 4 to end gay marriage in that state.

The Charleston event begins at 1:15 p.m. at Liberty Square, the park next to the South Carolina Aquarium at Concord and Calhoun streets. The plan is to march to Broad and Meeting streets by 1:30 p.m., organizers said.

Warren Redman-Gress of the Charleston-based Alliance For Full Acceptance said the only demonstrations he knows of are two events planned in South Carolina, but another still could be organized, possibly in Columbia.

Supporters have said they hope to stage demonstrations in more than 175 cities at exactly the same time — 1:30 p.m. EST — on Saturday. More than 250,000 people have committed to participating.

Connecticut voters approved same-sex marriage Nov. 4, joining Massachusetts as the only states where the practice is legal. Ballot initiatives banning the practice passed last week in Arizona, California and Florida, bringing the total number of states with constitutional amendments barring gay marriage to 30.

Two years ago, South Carolina voters approved an amendment to the state constitution that defined marriage as a bond only between a man and a woman. While the amendment was approved by a 3-1 margin statewide, it was narrowly defeated in Charleston and Folly Beach.

Opponents called the amendment an unnecessary change that would send a hurtful message to the state's gay and lesbian community, but supporters said it was needed to prevent an activist judge from legalizing gay marriage here.