Mr. and Mrs. Donald M. Slawinowski of West Seneca celebrated their 50th wedding anniversary with a family dinner. Mr. Slawinowski and Joanne V. Nowicki were married Nov. 17, 1962, in St. John Kanty Catholic Church, Buffalo. He is a retired psychiatric assistant at Buffalo General Hospital; she is a retired secretary for Merchants Mutual Insurance, Buffalo. They have a daughter and two grandchildren.