Monona County, IA Events Event Categories Benefits Bike Rides Car Shows County Fairs Festivals Flea Markets Monona County Event OutlookJuly 1, 2025 Monona County Fair - OnawaJuly 26, 2025 Annual Swap Meet Weekend - OnawaAugust 16, 2025 ONABIKE XXVI - OnawaOctober 11, 2025 Turkey Dinner - Onawa View our full calendar of events