'Allen Ginsberg: Photographs' at Tibor de Nagy Gallery, 41 West 57th Street, Sept. 7 to Oct. 7. 'Goya at the Metropolitan' at the Metropolitan Museum of Art,' Sept. 12 to Dec. 31. 'Alfred Stieglitz at Lake George' at the Museum of Modern Art, Sept. 14 to Jan. 2, 1996. 'Robert Rauschenberg: New Paintings' at Gagosian Gallery, 136 Wooster Street, Sept. 23 to Oct. 21. 'John Singleton Copley in America' at the Metropolitan Museum of Art, Sept. 26 to Jan. 7, 1996. 'Piet Mondrian: 1872-1944' at Museum of Modern Art, Oct. 1 to Jan. 23, 1996. 'Claes Oldenburg: An Anthology' at Solomon R. Guggenheim Museum, Oct. 5 to Jan. 14, 1996. 'Rembrandt/ Not Rembrandt' at the Metropolitan Museum of Art, Oct. 10 to Jan. 7, 1996. 'Edvard Munch and Harald Sohlberg: Landscapes of the Mind' at the National Academy of Design, Oct. 12 to Jan. 14, 1996. 'Worlds Seen and Imagined: Japanese Screens from the Idemitsu Museum of Arts' at The Asia Society, Oct. 18 to Dec. 31. 'Beat Culture and the New America: 1950-1965' at the Whitney Museum of American Art, Nov. 9 to Feb. 4, 1996. 'Robert Frank: Moving Out' at the Whitney Museum of American Art, Nov. 16 to Feb. 11, 1996.