The 150-year history of Princeton’s Red Covered Bridge will be showcased at a family picnic and program set for Monday at the bridge, located about one mile northwest of Princeton off Route 26. Sponsoring the event is the Bureau County Historical Society. Participating in the short program, which begins at 11:30 a.m., will be Princeton Mayor Keith Cain, Kathy O’Malley and Stephen Gunning. The program will be followed at noon by a picnic lunch, with BCHS Board members grilling hot dogs and providing lemonade, chips and cupcakes. The public is invited to bring their lawn chairs, have a picnic lunch and celebrate the Red Covered Bridge.