There was a large music festival near Miami of Ohio in 1975 or 1976 who has details about this?

I attended the Miami River Music Festival in the fall of 1975. I travelled there from southern Ontario and it was at the Cincinnati Race Track. The Eagles were performing, as well as many other bands such as New Riders of the Purple Sage, Nitty Gritty Dirt Band, Charlie Daniels, Marshall Tucker etc. I can't remember all the bands but it was a two day event. We camped in the area. What an adventure :)