TNL Onstage Season 15 Preliminary Round Two was held at Boardwalk, Waters Edge on the 1st of August 2015. Contestants who performed that night were: Karma, Resurrection, Cosmogyral, Synthesis, Sachini, Udara, Kovida and Nandun.

TNL Onstage Season 15 Preliminary Round Three was held at Boardwalk, Waters Edge on the 8th of August 2015. Contestants who performed that night were: Yohaani, Lustful Gaze, Amuthu, Against Gravity, Rhapsody, Jayanga, Nabith and Tharani.