If you're looking to spend Friday night, April 11, in Cincinnati, here are three hotels in the Eastgate Mall area, which is about 15 minutes from the regatta site at Harsha Lake. Here's a map from Hilliard to the Eastgate area.
The Holiday Inn looks like the best deal. Nice place with very good reviews on tripadvisor.com. Runs about $100.
The Fairfield Inn and Suites has good tripadvisor.com reviews, too, but seems to be pricey. $130-$150.
The Hampton Inn has been popular among Hilliard Rowing people in the past. About $100.