Go to Beckett.com
Scroll down to the bottom of the front page and look for the "Show Calendar" prompt. Click it
Use the drop window to put in Ohio in the state box. Don't use the city window due to Columbus having suburbs.
Enter some beginning and ending dates. Then hit Filter. This will list all the shows in Ohio for one or several months depending on the dates you enter.
Beckett.com also provides phone numbers for the promoters of each show. Just a word of advice, I would call the promoter a few days before the show to make sure it hasn't been cancelled or to make sure the dates are correct. I drove an hour last week to a show to find out someone listed the wrong dates.
Now since you live in Ohio and I have provided a fellow collector (my competition) with such valuable information to shows that I may be attending as well, if we happen to run into each other at one of these shows, you owe me one alcoholic beverage from the snack bar.
Hope this helps.
If you have any other questions, you can PM me.
Jantz