Good question on OH law, Q. Ohio does have some odd ones, such as any gun with a magazine over 30 rounds is treated like a machine gun in Ohio and illegal. So although I know this is a handgun carry event, some people do like to bring other firearms to show fellow gun-owners. So leave your huge magazines and drums at home.
Section 2923.11
(E) "Automatic firearm" means any firearm designed or specially adapted to fire a succession of cartridges with a single function of the trigger. "Automatic firearm" also means any semi-automatic firearm designed or specially adapted to fire more than thirty-one cartridges without reloading, other than a firearm chambering only .22 caliber short, long, or long-rifle cartridges.
That's 30 plus one in the chamber. HB191 would have struck that idiotic definition, but it hasn't been passed nor signed into law.
