What days or weekends run the grist mill for cornmeal

First Saturday each month from 2-dark

Definitely call if your going fort a demonstration. It hasn't been run in a long time. Not sure they even do it anymore.

If you go to Google maps, search for Jolly Mill and click on the joplinmolife.com link to their website. It will open up a page that has a lot of interesting information about the park. If you are not interested in any of that information, simply scroll down to the bottom and you will find a phone number for information about the park. Hope this helps.