FOOTLIGHTS
Twelve new members are inducted into American Academy of Arts and Letters; include Gore Vidal, Robert Brustein, Annie Dillard, Hnery Louis Gates Jr, Diane Johnson, J D McClatchy, Robert Pinsky, Richard Poirier, Tom Wolfe, George Walker, Yehudi Wyner, Rackstraw Downes, Umberto Eco, Frank Kermode, Wislawa Syzymborska, Harold Bloom, Robert Rauschenberg, Mario Cuomo, Harvey Lichtenstein; photo; National Gallery of Art in Washington will present free open-air concert on May 22 to celebrate its new Sculpture Garden and centennial of Duke Ellington's birth; Queen's Gallery in Buckingham Palace will stage exhibit, beginning on May 21, entitled Raphael and His Circle that will provide overview of principles of composition, types of figure drawings and systems of workshop collaboration that have influenced art; New York premiere of Marvin Hamilsch play, Zin! Zin! Zin! A Violin will be presented at Alice Tully Hall on May 23 by Metropolitan Youth Orchestra of New York, led by Scott Stickley; work sets to music book of same name by radio host Lloyd Moss (M)