NEW YORK (AP).- “Boy, this is a great city,” says Woody Allen, lounging on a park bench that overlooks Manhattan’s East River and the 59th Street Bridge. “I don’t care what anybody says. It’s really a knockout, you know?” The scene comes from Allen’s 1979 film “Manhattan,” an enduring, romantic portrait of the director’s hometown, “a town that existed in black and white and pulsated to the great tunes of George Gershwin.” It’s a time capsule of a bygone New York, long before the soundtrack was changed on Sept. 11, 2001. On Sunday, New York cinemas, museums, concert halls, galleries and theaters will abound in cultural events held in commemoration of the 10th anniversary of that day. The happenings vary from screenings of old movies such as “Manhattan” to grand Lincoln Center symphonies to humble one-man shows. But they all seek to use the arts — a bedrock, still, of New York life — to share