AMERICAN CITIES; Los Angeles Clubs of the MomentWendell Green, who is the general manager of the Lounge at the Standard in Hollywood (as well as the Roof Lounge at the Standard's downtown hotel), has a few theories. One is that on weekends, the Hollywood crowd avoids Sunset Boulevard, which is overrun by drunken, ''yo, baby''-yelling revelers from the San Fernando Valley and Orange County. ''My girlfriend always quotes 'Ghostbusters,''' Mr. Green said. '''Don't cross the streams, it would be bad.' Here, the crowds don't intermingle.''
Mr. Green originally started Wednesday nights as a small underground party, with no intention of competing with bigger clubs. He booked two musicians, Danny Saber and Twiggy Ramirez, as disc jockeys. But, Mr. Green said, the night ''caught like wildfire, and it got so popular that Twiggy and Danny stopped doing it because their friends couldn't get in.''
''The Bolthouse parties in particular are a hunting ground,'' Mr. Green of the Standard said. ''Female celebrities don't go out. Male celebrities go out. So the parties became known for having the male celebrities, like Shaq and Justin Murdoch and Brandon Davis and Leonardo DiCaprio. They used to all hunt in a pack.''