Mr. and Mrs. William Marquard of Plano, Texas, formerly of East Amherst, celebrated their 50th wedding anniversary with a family gathering at Lake Anna, Va. The couple will take a cruise to China and visit their son and daughter-in-law in Beijing at the end of summer. Mr. Marquard and Gail Edwards were married June 16, 1962, in Salem United Church of Christ, Tonawanda. He is a retired international executive for OxyChem. They have four children and six grandchildren.