FENIMORE EXHIBIT ENDING This Is Last Weekend For Rock, Roll Photos By LIBBY CUDMORE • Special to www.AllOTSEGO.com COOPERSTOWN – “Herb Ritts: The Rock Portraits” was a game-changer for The Fenimore Art Museum. “Our admissions at The Fenimore were up 13 percent from last year,” said Paul D’Ambrosio, president. “This tells us that we need to keep appealing to a broader, younger audience.” The portraits – Monday, Sept. 2, is the exhibit’s last day – include Madonna, David Bowie, Prince…