INTERNATIONAL SUPERSTAR GLORIA ESTEFAN ADDED TO FESTIVAL PEOPLE EN ESPAÑOL 2013: TWO-DAY CELEBRATION OF HISPANIC ENTERTAINMENT, CULTURE AND COMMUNITY SATURDAY, AUGUST 31AND SUNDAY, SEPTEMBER 1 IN SAN ANTONIO, TEXAS NEW YORK, NY (April 24, 2013)–Seven-time Grammy-winning singer, songwriter, actress and entrepreneur Gloria Estefan, Cuban-American pop/hip hop singer and