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Forget the screenings: Cannes revelers had plenty of nocturnal activities at their disposal this past weekend.

Things kicked off Friday night when news of a performance by Debbie Harry at the Belvedere Vodka party drew hordes of guests including Delfina Delettrez Fendi, Robin Wright Penn and Colette’s Sarah Lerfel to the Le Baron club. Many more clamored to get in.

This story first appeared in the May 19, 2009 issue of WWD. Subscribe Today.

Harry finally took the stage at 2 a.m. “This one’s called ‘French Kissing in the USA.’ Anyone from Paris?” she said, before crooning over a tinny PA system, karaoke style.

Meanwhile, a manic Rosanna Arquette dashed about the room dragging ladies in front of a camera to pose with hip hop singer Postman. “Out of the way, I’m working; I’m filming a music video,” she yelled.

The next night, hundreds of revelers headed to Soho House at the Château de la Napoule for the Art of Elysium fete hosted by Cartier, Relativity Media and Grey Goose. Quentin Tarantino, Paula Patton and Kevin Pollack mingled under trees hung with lanterns.

“For me, Cannes is the film Olympics,” declared Tarantino, whose, “Inglourious Basterds,” premieres here Wednesday.

Down at the old port, Mariah Carey, who plays a dowdy Harlem social worker in the film “Precious,” which premiered Friday, channeled her glamorous diva side, partying late into the night on the Cavalli boat. Host Eva Cavalli had scattered jewelry and orchids across the dining table and served fish under the stars.

“I like to use personal things [as decoration],” she said.

Diehard soccer fan Roberto Cavalli was missing in action due to an important match in Florence. But the designer surfaced Sunday night for a party in Chopard’s suite on the top floor of the hotel Martinez, attended by Eva Herzigova.

Over at the Vitaminwater beach, Quintessentially hosted a bash for Sam Taylor-Wood’s debut feature film, “Nowhere Boy.” As Harvey Weinstein, Georgina Chapman, Diane Kruger and Ralph Fiennes flowed into the event, Taylor-Wood disclosed that “Atonement” director Joe Wright had placed the film’s script in her lap.

“The whole thing felt serendipitous,” she said.

Her 19 year-old star Aaron Johnson, who plays a young John Lennon, was enjoying his turn in the spotlight. Dressed in an edgy Alexander McQueen suit, he hoped he’d managed to capture the essence and spirit of the late Beatle.

“I tried not to think about how big the role is,” he said.