The New York downtown scene of the sixties and seventies was a place of overlapping friendships and studio space, and the artist Robert Rauschenberg was at the center of it. Rauschenberg’s designs brought a witty, even Surrealist edge to the works of the choreographer Merce Cunningham; later, Rauschenberg worked with the younger Trisha Brown. Almost nine years after her death, Brown’s Trisha Brown Dance Company performs her silvery, fluid “Set and Reset” (1983), to a memorable score by Laurie Anderson, paired with Cunningham’s “Travelogue” (1977), for which Rauschenberg created a performance arena that included bicycle wheels, flags, and tin cans—everything but the kitchen sink.—Marina Harss (BAM; Feb. 26-28.)Classical