Back to the summer of 1967, to one of many arrivals. The bus to Port Authority, the subway to Brooklyn, and, finally, the room with the curly-haired boy. As Smith wrote in her award-winning 2010 memoir, Just Kids, “It was a good day to arrive in New York City. No one expected me. Everything awaited me.” “I remember almost everything,” Davis says, speaking to Vanity Fair last month about “Paths That Cross,” an exhibition that features work by Davis, Smith, and Mapplethorpe, opening September 18 at Weinstein Hammons Gallery in Minneapolis. The highly personal curation of photographs (gelatin silver prints, many of them vintage, and unique Polaroids), sculptures, drawings, postcards, videos, and other unique works represents direct collaborations among the artists, as well as their friendships. In total, 40 works will be presented in the airy, 2,000-square-foot gallery. “Those were just very busy years. I had great friends,” Davis recalls. “In those days, even if you didn’t have much money, you had access to a lot of things. One would go to the theater, the …