Mr. and Mrs. John W. Ryndak of Buffalo and Kissimmee, Fla., celebrated their 50th wedding anniversary with a renewal of their marriage vows in Our Lady of Perpetual Help Catholic Church, followed by a gathering of family and friends in Polish Villa II Restaurant, Cheektowaga. A Caribbean cruise is planned. Mr. Ryndak and Delores C. Przewozny were married Sept. 7, 1957, in St. Casimir Catholic Church, Buffalo. He is retired from the U.S. Postal Service. The couple has three children and five grandchildren.