Back in the day, Cedar Point was a very popular vacation spot with facilities for large crowds. Good rail service (before the era of flight and before car ownership and driveable roads), hotels, buildings available for speeches, etc. It was kind of like the Disney World of the time. There is still an amusement park there of considerable size. I've never been to it, but I know people who have.
Curiously, the 1931 Convention where they adoped the JW name was also in Ohio, at the Ohio State Fairgrounds in Columbus. The building where the name was adopted is still standing and is now a horse barn where the equestrian events are held. I went in there once to watch a horse competition and as I sat there smelling the horse crap I thought it quite fitting.