PRINCETON — Open Prairie United Church of Christ will celebrate its 10th anniversary on Sunday. In honor of this milestone, the Rev. Curran Reichert, who served as Open Prairie’s first pastor from 2003 to 2008, will give the 10:30 a.m. sermon. Reichert currently serves as pastor of Community Congregational Church of Tiburon in Tiburon, Calif. Following worship, there will be a potluck at Hornbaker Gardens at 1 p.m. For more information, contact the Open Prairie office at 815-872-5150.