Mahaska County, IA Events Event Categories Art Shows Festivals Holidays Reenactments Mahaska County Event OutlookJuly 31, 2025 Dog Hollow Rendezvous - OskaloosaAugust 10, 2025 Sweet Corn Serenade - OskaloosaDecember 6, 2025 Lighted Christmas Parade Activities in the Alley - Oskaloosa View our full calendar of events