The U.S. Army Corps of Engineers will host activities during the 7th annual Red Rock Balloonfest.

Nature’s Fireworks: Fireflies will highlight the insects at 9 p.m. at Wallashuck Campground this evening. Let’s Go Padding is scheduled to take place at North Overlook Beach next to balloonfest activities from 9 to 11 a.m. Saturday. Archaeology at Iowaville is set to begin at 1 p.m. in the Visitor Center, where park rangers discuss archeological excavations at the home of the famous Ioway leader, Mahaska. Call of the Wild will be held at the Playscape at 3 p.m. All activities are free of charge and preregistration is not required.