PARK SLOPE File this under: Surprised These Tickets Haven’t Sold Out Yet. Patti Smith and Lenny Kaye join the powerful harmonium-rocker Shilpa Ray and Her Happy Hookers, Outernational and other special guests at Southpaw tonight. BrooklyntheBorough.com is sponsoring this special acoustic concert which benefits the Fortnight Journal, an online project in which 14 millennials document their endeavors by submitting one story every two weeks. An older, wiser luminary then selects one of these young ‘uns and offers a creative or critical response. Next week, Patti Smith, whose new memoir Just Kids was recently nominated for a National Book Award, will be the first to offer her sage advice.