Advocacies OPM hitmakers Gary Valenciano, Dingdong Avanzado, Gino Padilla, Kuh Ledesma, and Martin Nievera to serenade fans on Labor DayBy Team OrangeApril 29, 20200 OPM hitmakers Gary Valenciano, Dingdong Avanzado, Gino Padilla, Kuh Ledesma, and Martin Nievera will render uplifting performances for the second…