Festival de Plena in Ponce
Festival de Plena likely refers to the Festival de Bomba y Plena de San Anton, held each November in Ponce's San Anton barrio since 1978, which combines both bomba and plena rather than presenting plena as a separate standalone event.
Ponce's San Anton barrio hosts one of Puerto Rico's most specifically documented Afro-Puerto Rican music festivals, the Festival de Bomba y Plena de San Anton, held every November since 1978.