Gay activists are preparing for Wednesday's ruling on whether California's gay marriage ban, Proposition 8, violates the U.S. constitution.

It is the first federal trial to challenge the constitutionality of a gay marriage ban and is expected to reach the Supreme Court.

The American Foundation for Equal Rights (AFER), the group behind the case, will hold a press conference in San Francisco immediately after the decision is announced, sometime between 1PM and 3PM PT. Lawyers who argued the case, Ted Olson and David Boies, as well as AFER President Chad Griffin and plaintiffs Kris Perry, Sandy Stier, Paul Katami and Jeff Zarrillo, are expected to speak at the event to be held at The Bentley Reserve hotel.

AFER is also hosting a public rally in West Hollywood at the West Hollywood Park on North San Vicente. The demonstration begins at 6PM.

Another march in Phoenix is also planned. Gay activists say they'll march tonight from the Cesar Chavez Plaza to the Sandra Day O'Connor federal courthouse. The rally, which begins at 5:30PM, is being organized by the gay rights group HERO.

“Come out and join your friends, let your voice be heard, and demand your constitutional rights TODAY no matter what the decision is!” the group told members in an email.