Golden AnniversaryDr. and Mrs. Tunis Baker, 650 Concord Dr., will celebrate their 50th wedding an-mversary on Saturday, June 25.They will be honored at an open house, hosted by their children, in Hope Reformed Church parlors from 2 to 4 p.m. Friends, relatives and neighbors are invited.Mrs. Baker (Janet) is the daughter of the Rev. PeterTunis Baker• Bouma who at one time was pastor of Fourth Reformed Church in Holland. Dr. Baker is former professor of science education at Hope College. They were married in 1927 by Rev. Bouma in Clifton, N.J.Their children are Dr. and Mrs. Maynard De Young of Fort Collins, Colo., and Dr. and Mrs. James Baker of Long Beach, Calif. There are eight grandchildren.Dr. and Mrs.