Sultry Siren Note: Used to be that actors made a name in New York then went to L.A. to make money for their agents and themselves by doing television. Morgan Fairchild is reversing that trend. Starting Dec. 1 she will be appearing off-Broadway, probably not making all that much for herself or her agent, in a play called "Geniuses," a comedy about a slightly bonkers movie-directing genius who has trouble making his epic in the Philippines (Yes, it's supposed to remind you of "Apocalypse Now"). Arena Stage will be putting on its own version of the play in the spring . . .

Anything You Can Do We Can Do Better Note: Previews were to have begun last week for an unusual production of "Hamlet," which Joseph Papp has been directing for several weeks in New York. The production, in which the Prince of Denmark is being played by a woman, Diane Venora, ran into a snag when the actress severely bruised a bone in her foot during a dress rehearsal of the climactic duel scene . . . Long and Narrow Note: Artist Robert Rauschenberg went on a trip to China last summer and like anybody taking a long trip to an exotic place he took a bunch of pictures. Now he is taking all the negatives and having them developed into one composite, which will be approximately 90 feet long and 28 inches wide. The photo will go on display New Year's Eve at Leo Castelli's Gallery in Soho . . .

Thanksgiving Note: Thursday, while most Americans partake in the first gorging of the holiday season, Jamaicans will hold a three-day music festival to celebrate the opening of a new sports and entertainment complex. Prime Minister Edward Seaga will preside at the opening of the Bob Marley Memorial Centre. Also expected to be present are the late reggae star's wife, Rita, and their five children . . .

Moving Over to the Administrative Side Note: Rudolf Nureyev signed a three-year contract last week to become director of the Paris Opera Ballet. Nureyev's duties begin next November and will require him to be in Paris six months a year. In addition to choreographing for the Opera Ballet he is expected to perform 30 times a year . . .