As John said, you can’t organize a moving event through UCR without following the club’s insurance rules. You are saying it’s not a PCA event but you are using the UCR website to contact additional UCR members to organize a moving event.
We have a Fun Run Chairman for exactly that purpose. You’re more than welcome and even encouraged to head up an event like this, but please do it within the existing framework. Like all things in modern life there is liability for both the club and yourself personally. It’s important that you follow the rules.