After appeals from Edward James Olmos to sit down “or the fire marshals won’t let us start the movie,” the U.S. premiere of Mexican hit “Ladies Night” began unspooling — an hour late — Friday to kick off the eighth annual Los Angeles Latino Intl. Film Festival.So packed was the Egyptian Theater that Olmos nearly went without a seat himself. Pic’s director Gabriella Tagliavini found that seats for her and her cast had been grabbed by others. Screening was followed by a raucous salsa party in the courtyard. Seen at the opening night were filmmakers Jim McBride and Arturo Ripstein, screenwriter Paz Alicia Garciadiego, actors Lupe Ontiveros, Luis Roberto Guzman and Spain’s Pablo Carbonell, whose directorial debut “Tuna and Chocolate” competes at the fest.