Gay and lesbian artists called Monday for an artistic and audience boycott of California Musical Theatre after learning that its artistic director donated $1,000 to a campaign that backed banning gay marriage in California.Scott Eckern was not available for comment Monday as the revelation has gained stunning momentum on the blogosphere. The California Musical Theatre produces the Music Circus, presents Broadway Sacramento, and recently opened "Forever Plaid" at the capital's newest performing venue, the Cosmopolitan Cabaret.Richard Lewis, the organization's executive producer, said the board of directors will conduct an emergency meeting on the matter this afternoon. He said it was too early to tell how this would affect Eckern's 25-year employment with California Musical Theatre