JON Bon Jovi knows how to rock a crowd and keep it under control at the same time. Saturday night at his East Hampton home, he invited 60 of his closest friends, including Jack Nicholson, for his annual end-of-summer bash including a live performance and fireworks. When the show kept raging after the local 11 p.m. sound curfew, police rolled up to shut down the stage — but the diplomatic rocker invited the officers in just to squeak out one last song.

The holiday good will was less evident the next day at the Hampton Classic FTI Grand Prix horse event, attended by Madonna among other boldfaces, when Christie Brinkley made her way in the direction of ex-husband Peter Cook and his girlfriend Suzanne Shaw. Photographers noticed the two were about to cross paths and aimed to get them in the same frame, but Shaw averted the awkward shot by grabbing Cook, spinning him around and racing in the opposite direction.

Proud parents Michael Bloomberg and Lou Dobbs couldn’t be happier watching their respective daughters, Georgina and Hillary, compete. Neither woman won on Sunday, but Dobbs took home the Fendi Cup Saturday with her horse, Morengo. Kelly Ripa and husband Mark Consuelos, Matt Lauer, Jill Rappaport and Rudy and Judith Giuliani also attended.

At Nacho Figueras‘ first annual Sunday Classic in Bridgehampton benefiting Ride to Work, the hunky polo player bubbled to guests about his big plans to bring the glamour of the sport back to Hollywood and boasted to Elegant Affairs caterer Andrea Correale about his upcoming appearance in an Owen Wilson picture.

Several towns to the west, at the opening of Hotel Indigo in Riverhead, Dennis Rodman went wild. The ever-so-classy ex-NBA star grabbed the wireless microphone to yell his requests to the deejay. He was seen later ducking to take a leak behind a cabana where former Miss USA Julie Hayek and socialite Anna Rothschild were lounging.