On Wednesday night, a throng of actors, cycling through a swirl of events — awards season, New York Fashion Week and the Super Bowl — assembled in Midtown Manhattan, wearing Chanel, dressed by Chanel and for Chanel.

Over cocktails, guests mingled for the opening of the brand’s first U.S. watch and fine jewelry flagship boutique on Fifth Avenue near 57th Street, designed by the architect Peter Marino with elements from Coco Chanel’s apartment in Paris.

America Ferrera greeted Natasha Lyonne. Kerry Washington chatted with Elizabeth Olsen. Katie Holmes posed for photos with Michelle Williams. Zazie Beetz convened with Rachel Brosnahan. Dianna Agron lingered. And nearby, Carey Mulligan and Jerrod Carmichael talked.

The new flagship store for fine jewelry and watches comes as New York’s retail space prices have kept rising over the past year. The move seemingly positions Chanel in a sector of the fashion industry that other brands, like Prada and LVMH, are also embracing.

The location on Fifth Avenue — sandwiched among Cartier, Tiffany & Company, Bulgari and Harry Winston — was a yearslong waiting game, according to Frédéric Grangié, the president of Chanel’s watches and fine jewelry.

“It’s a big step for the house,” Mr. Grangié said.

Steps away from the boutique, around 200 guests, including Lori Harvey, Francesca Scorsese and the actor Molly Gordon, shuffled into a dimly lit event space for dinner. In contrast to the store’s well-lit sparkle, the multilevel venue was enveloped in darkness, that mimicked the shuttered Abercrombie & Fitch that was once there.

People reflected on their favorite everyday accessories, like Ms. Lyonne’s grandmother’s gold chain. “I never saw her as a Tony Montana type. She was just a little Hungarian lady in a Pucci dress,” she said.

The actor, Taylour Paige, who loves her tennis bracelet and engagement ring, said that you can never have too many rings.

“If anyone says you’re wearing too many rings, cut them out of your life,” she said.

For the actors Tommy Dorfman and Amandla Stenberg, watches, which were family heirlooms passed down from generations, elicit a sense of nostalgia and sentimentality in an era of smart devices.

White roses lined long tables where influential guests like Lauren Santo Domingo, the artistic director of Tiffany’s homewares; Larry Gagosian, the gallery magnate; and Sean MacPherson, the hotelier, enjoyed oysters, caviar-topped potatoes, lobster or wagyu, and a two-tiered assorted dessert tower. After one course, guests were offered vodka shots.

Seth Meyers, the late-night host, did rounds greeting Ms. Ferrera and Ms. Olsen at one table, Ms. Beetz in another section with Ms. Holmes, and then later settling at his table with Ms. Washington and Ms. Williams.

When it grew late, the crowd was invited to the basement for a surprise performance, and the singer Gracie Abrams took the stage to a backdrop lit like a starry sky.