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On Friday, Broadway collectively marked the anniversary by singing “New York, New York” in Times Square, as cast members and musicians did in the days after 9/11.

Lincoln Center will host a special screening of Spike Lee’s “25th Hour,” with the director in attendance. Lee integrated 9/11 into the film, including opening credits that feature the floodlights that shined from the trade center site.

The Museum of the Moving Image will screen “Man on Wire,” the Oscar-winning documentary about French high-wire artist Philippe Petit’s wire walk between the tops of the twin towers in 1974.

Located on the edge of the downtown zone that was closed after Sept. 11, the Film Forum, New York’s bastion of repertory film, was forced to close for several days after the event. At the time, it was running an “NYPD” series of movies featuring New York’s finest, including “French Connection” and “The Taking of Pelham 123.”

To commemorate the 10th anniversary, the Film Forum is running the series again, in tribute to the New York Police Department. On Sunday, it will screen Sidney Lumet’s “Serpico,” Jules Dassin’s “The Naked City” and the lesser-known “Pay or Die!” with Ernest Borgnine as early NYPD organized crime-fighter Joe Petrosino.

“We don’t do this kind of thing a lot, commemorating,” says Bruce Goldstein, repertory director of the Film Forum. “But 9/11 was just too memorable a day, too traumatic a day not to recognize it some way, in the way that we do best, which is showing films.”

In Bryant Park, a tribute will be held with empty chairs representing each New York victim of the terror attacks. As part of an exhibition by artist Sheryl Oring, several typists will record visitors’ thoughts about Sept. 11. (There are many memorials and tributes being held around the city, including “Tribute in Light,” two beams of light that will echo the twin towers.)

The Met is exhibiting “The 9/11 Peace Story Quilt,” which Faith Ringgold designed, collaborating with New York students, ages 8 to 19. The New Museum, free on Sunday, will feature Spanish artist Elena del Rivero’s installation. It’s modeled after her downtown apartment, which filled with debris after the attacks.

MoMA PS1, one of the nation’s oldest and largest nonprofit contemporary art institutions, will open the exhibit “September 11” with 70 works from artists such as Diane Arbus, Christo and Yoko Ono that examine how 9/11 has “altered the ways in which we see and experience the world.” The Brooklyn Museum is holding the exhibit “Ten Years Later: Ground Zero Remembered.”

There will be many photography exhibits, including one at the International Center of Photography; Joel Meyerowitz’s “Aftermath”; Joe McNally’s portraits of 9/11 heroes, “Faces of Ground Zero: 10 Years Later”; Camilo Jose Vergara’s decades-long study of the World Trade Center, “The Twin Towers and the City”; former NYPD detective John Botte’s photographs; and many more.

Sarah Skaggs’ “9/11 Dance _ A Roving Memorial” will bring meditative choreography to several locations around the city.

There are, of course, many, many other events across the city Sunday. And the gatherings won’t be over then, either. On Monday, comedians Kristen Schaal and Kurt Braunohler will host the second annual 9/11 memorial puppy-hugging parade in the Gowanus section of Brooklyn.

As the narrator says in the great old Dassin movie: “There are eight million stories in the naked city.” On the 10th anniversary of Sept. 11, there will be at least that many.