Mr. and Mrs. John Slack of Medina celebrated their 50th wedding anniversary with a surprise Thanksgiving weekend trip to the National Baseball Hall of Fame in Cooperstown, followed by a family dinner in the Otesaga Resort Hotel. Mr. Slack and Valerie Sanderson were married Jan. 4, 1964, in St. Mary Catholic Church, Medina. He is retired from Fisher-Price, Medina. She is a retired English teacher in the Medina School District. They have two sons and two grandsons.