Monona County, IA Events Event Categories Benefits Bike Rides Car Shows County Fairs Festivals Flea Markets Independence Day Monona County Event OutlookMay 31, 2024 Lewis & Clark Festival - OnawaJune 7, 2024 Annual Blast from the Past Graffiti Night - OnawaJuly 27, 2024 Annual Swap Meet Weekend - OnawaAugust 17, 2024 ONABIKE XXVI - OnawaOctober 12, 2024 Turkey Dinner - Onawa View our full calendar of events