Doing some visible activities with children a couple times over the summer. Goal is to wind up with an ongoing Bible study after the initial study. Knowing your purpose will allow you to evaluate every three to six months to determine whether you're meeting your objective. If you're not meeting your targeted objective, then by evaluating every three to six months, you're giving yourself the opportunity to redirect your resources into another ministry or disband that particular ministry. Just wanted to mention - we're planning to do the study on Sunday nights.
Purpose is to penetrate a population of unchurched that is being missed by area churches.
Communicating around established and accepted values will help. The Great Commission has always been and should continue to be the driving force behind either on or off-campus Sunday School groups. Unfortunately, many of those cases deal with either sexual abuse or neglect. We would not want a teenager to supervise a child or preschooler in an off campus setting without an adult present. Don's clarification handles my comment of responsibility.