The Georgetown Club is not the kind of place where celebrities are bothered for autographs, but it didn't go unnoticed that actor Sidney Poitier and Supreme Court Justice Thurgood Marshall were having lunch there together yesterday. Poitier was getting a firsthand look at the man he will portray in the movie "Separate but Equal." Other than yesterday's lunch, Marshall is not involved with the film.

In the movie, which is being produced by George Stevens, Poitier plays Marshall, who in 1954, as director of the NAACP Legal Defense Fund, argued the landmark desegregation case Brown v. Board of Education before the U.S. Supreme Court. Veteran actor Burt Lancaster has been cast as Poitier's courtroom adversary. Since filming will not be permitted inside the Supreme Court building, interior scenes will be shot elsewhere. But late next month, scenes will be shot outside the court building. Out and About All that turmoil, moving people into different rooms, and all those State Department security people underfoot at the Four Seasons Hotel in Georgetown yesterday were unavoidable. The hotel was trying to clear two floors in preparation for the arrival of Jordan's King Hussein in the early hours of the morning. Hussein, coming here in his role as middleman between Iraqi leader Saddam Hussein and President Bush, took over the Presidential Suite and some 50 other rooms for his entourage ...

Actor Charlton Heston has quit Actors Equity in protest of the union's decision to bar a Caucasian actor from reprising his Eurasian role in "Miss Saigon" on Broadway. The Oscar-winning actor called the decision against British actor Jonathan Pryce "obscenely racist." He said he was deeply ashamed of the first union he joined and would resign full membership immediately ...

Hospital Report: Rhythm-and-blues singer-guitarist Curtis Mayfield underwent surgery yesterday for spinal injuries sustained when a powerful wind knocked a lighting tower over on him as he was starting a concert in Brooklyn, N.Y., on Monday. Mayfield's agent, Bill Mennot, said the "Superfly" singer's family was told that Mayfield had broken several vertebrae in his neck and was in critical condition ...

It was almost romantic enough to become a movie. Meredith Mendelsohn, who went to Pyle Junior High School in Chevy Chase, was at a wedding in Santa Barbara, Calif., when a photographer working on a cover photograph for Fortune magazine asked her to pose with Aaron Evans for a story on rising young managers. They look made for each other on the August cover, and the 25-year-old Evans told the 19-year-old University of California, Santa Barbara, sophomore that he was interested in being more than just a cover model with her. But the story ended there; this pretty woman already has a boyfriend ...

Stop the presses! It can now be reported that Bert Parks will be at this year's Miss America pageant. Parks, who was fired in 1980 after 25 years of hosting the beauty contest, has accepted an invitation to come back for the pageant's 70th anniversary this year. His role in the ceremonies is to be announced at a press conference in New York today. The 75-year-old Parks said he would not return just to sing "There She Is" to the weeping winner ...

There are no current reported sightings of Elvis at the 7-Eleven or working on his farm in rural Georgia as the 13th anniversary of The King's death comes up tomorrow. Another Elvis book is coming out, however. This one -- "The Death of Elvis Presley" -- by Charles Thompson II and James P. Cole, gives the first detailed report on the singer's autopsy and shows that Elvis miscalculated the combined effect of the various uppers and downers he took and died of an overdose. It is not a big surprise, but the Shelby County (Memphis) medical examiner had said Elvis died of heart disease and the autopsy report was sealed at the family's request ...