The first two, October 14 in Labadie, Missouri and October 20, in Marthasville, Missouri are Missouri Two Cylinder Club events, which means you have to be a member of the club. But you can pay a $20 membership fee the day of the plow event and you're in. Membership will cover insurance to participate in the event as well as a newsletter sent quarterly and a Christmas dinner.
I believe the November 4 is not a club event so should be open to all. It will also be in Marthasville. More info will be posted when it comes available.