Slash is striking out on his ‘S.E.R.P.E.N.T. Festival Tour’ in support of his upcoming solo album “Orgy of the Damned” that will send him to amphitheaters, ballrooms, casinos, parks, rooftops and theatres all over the globe.That includes gigs at Buffalo’s Artpark Outdoor Amphitheater on Tuesday, July 30 and New York City’s The Rooftop at Pier 17 on Sunday, Aug.