That was Georgetown University star Patrick Ewing at Duke Zeibert's yesterday, celebrating his probable future with the New York Knicks hours after the team won the right to draft him. With him were his Georgetown coach John Thompson, teammate Ralph Dalton, Ewing's agent David Falk and Georgetown academic coordinator and adviser Mary Fenlon all eating like winners . . .

All those glittery stars going into the National Theatre tonight for the first Helen Hayes Awards are to include Karen Allen, Maurice Hines, James MacArthur (Hayes' son and an actor himself), Bruce Weitz, Robert Foxworth and George Grizzard, as well as longtime Arena Stage star Robert Prosky, the master of ceremonies, now better known as Sergeant Jablonski running the "Hill Street Blues" roll call. And expected to be the surprise guest of the evening is Academy Award winner Jose Ferrer, the man who to many is Cyrano de Bergerac . . .

Time markings: Surrealist artist Salvador Dali turned 81 on Saturday and said he wanted to be left alone . . . On that same day, the man who is American music, Irving Berlin, quietly celebrated his 97th birthday at home in New York . . .

Sylvester Stallone got so banged around while filming fight scenes for "Rocky IV" in Canada last week that he ended up hospitalized in Santa Monica, Calif., suffering from the flu and boxing injuries. He was released Saturday after spending two nights in the hospital . . .

More than 3,500 art lovers visited the Philadelphia Museum of Art yesterday for the opening of the first major American exhibition of Marc Chagall's works in 40 years. The show was planned as a tribute to a living artist but has become instead a memorial to the man who died March 28 at 97 . . .

Pianist Van Cliburn, who hasn't performed publicly since 1980, said he plans to end the intermission in his career. "I've always said every concert needs an intermission. I'm not retired," he said. "The second half of my concert will commence soon. I've been trying to decide on a date" . . .