So, Parkville MO (near KC) has an ordinance explicitly prohibiting carrying weapons in city park. But, all of their city codes are out of date with respect to CC in general. They certainly have the authority to prohibit OC under the state constitution, but I don't know about CC. I don't believe that 571.107 bans CC under park parks (as opposed to amusement parks) and I don't believe that subdivisions can ban CC anywhere except city facilities (which would imply a building). So, that would seem to make it OK, but I'd hate to get arrested over something that silly.