This Sunday, at Central Park's Rumsey Playfield, as part of the Summerstage Festival, Fania will mark 50 years since it started erecting that bridge. It was built on the work of artists as renowned as Celia Cruz, Ray Barretto, Bobby Valentin and Hector Lavoe. The program combines the label's — and, by extension, salsa's — legacy with what Rucker hopes will be its future. A cast of DJs and remixers, including Joe Claussell, the Whiskey Barons and Bobbito Garcia, will spin their updated takes on the Fania classics in between playing some originals. It's a dance party built on rhythms rooted in a host of cultures.