Its seems that the weekend of august 29th will be very busy for Makers. Marker Faire (29 - 30th) and Red bull SoapBox (29th)
You can apply for both online
http://cincinnatimakerfaire.com/
http://www.redbull.com/us/en/events/1331712287106/red-bull-soapbox-race-ohio-2015
Marvin