Not Appleseed as you're trying to find, but Revere's Riders has a few more basic rifle courses scheduled for this year. One is coming right up on 10 September at the Crawfordsville Gun Club, and is a 1-day youth only event ... no cost to attend ... here's the link ... https://www.reveresriders.org/event/2017-sep-10-crawfordsville-in/
Another is 23-24 September in Bedford. Standard 2-day event that you and your son can both attend ... both days have an AWESOME lunch provided as part of the cost ... here's the link ... https://www.reveresriders.org/event/2017-sep-23-24-bedford-in/
You can't go wrong with either organization when it comes to learning the basics of rifle marksmanship.