The event, advertised on flyers around New York, was one of several lookalike competitions hosted by YouTube personality Anthony Po.
As word spread on social media, thousands of people RSVP’d to the event, which promised $50 to the winner.
“It started off as a silly joke and now it’s turned pandemonium,” said Paige Nguyen, a producer for the YouTube creator.
Most of the Chalamet impersonators and spectators relocated to a new park.
On a makeshift stage, the lookalikes were asked about their romantic plans with the actor’s rumoured partner, Kylie Jenner.
They were also asked to demonstrate French proficiency and what they would do to make the world a better place.
Eventually, the audience picked a winner: Miles Mitchell, a Staten Island resident and college senior.
Dressed in a purple Willy Wonka outfit, he tossed candy from a briefcase to throngs of young admirers.
“I’m excited and I’m also overwhelmed,” he said. “There were so many good lookalikes. It was really a toss-up.”