More than 100 singers and the members of the South Fork Chamber Orchestra will join together on Saturday to perform George Frideric Handel’s well-known Baroque masterpiece “Israel in Egypt” and Cantata 79 by J.S. Bach. The Choral Society of the Hamptons will team up with the Greenwich Village Singers in the performance. Both groups are directed by Mark Mangini, who will conduct. Suzanne Schwing, mezzo-soprano, and Mischa Bouvier, baritone, are known here from previous concerts with the Choral Society. Sara Paar will be the soprano.