The music of Richard Wagner is rarely heard in South Florida. It has been decades since Florida Grand Opera produced a Wagner opera and fifteen years since Palm Beach Opera’s production of Tannhäuser. There doesn’t appear to be any Wagner offerings from either of the region’s professional companies on the horizon anytime soon. All the more credit then to Michael Rossi, artistic director of the Miami Music Festival, for organizing the festival’s Miami Wagner Institute. Dedicated to coaching and nurturing the next generation of Wagnerian singers, the institute presented a debut concert on Saturday night before a nearly full, highly enthusiastic house at the New World Center in Miami Beach. Headed by star soprano Christine Goerke and veteran vocal coach and conductor Kathleen Kelly, the project displayed some promising vocal talent at its initial public outing.