From Doug French:
Ditmars Orchard in Council Bluffs has an annual Hot Air Balloon Festival. I have gone the last couple of years and it is always very colorful and beautiful. They do a night glow where the balloons stay tethered to the ground but they light the balloons up like light bulbs. Great time to get up close and get some great hot air balloon photos. This years show is the weekend of September 13-15, 2013.
From last year: