Summer in Ohio promises vibrant festivals, community events, and endless fun. Summer in Ohio promises vibrant festivals, community events, and endless fun. The Official 2024 Ohio Summer Events Guide has everything needed to plan seasonal adventures, with highlights from all 88 counties, including Delaware County. For a full list and to download a printable copy of the guide, visit Ohio.org/Summer. Share experiences with #SummerinOhio and #OhioTheHeartofitAll!