Footlights
New York Philharmonic series of concerts in parks will open July 10 in Central Park; David Wiener's play Blood Orange opens; play is first of five new plays developed this season under Cherry Lane Alternative's mentoring program; David Henry Hwang is playwright's mentor; David Nasaw's book The Chief, Michael A Bellesile's Arming America: The Origins of a National Gun Culture and Susan Lee Johnson's Roaring Camp: The Social World of the California Gold Rush win Bancroft Prizes; Museum of Modern Art to open retrospective on avant-garde filmmaker Stan Brakhage; photos (M)
