Mr. and Mrs. Richard M. Arendt of Orchard Park celebrated their 50th wedding anniversary in Colorado. A gathering of family from around the country surprised the couple with a long weekend of events. Mr. Arendt and the former Patricia Knowles were married Oct. 19, 1963, in St. John the Baptist Catholic Church in Kenmore. Mr. Arendt is a retired sales administrator for Fisher Price Toys. They have two children and two grandchildren.