At the annual Sportsman’s Expo here, we have put on an archery exhibit that includes shooting for those who may not have ever shot before for years, with no bad experiences. Our rules are:
One line for those waiting to shoot, monitored by an adult at the head of the line who sends people to shooting positions as they become available.
One adult at each shooting position who explains very briefly how to shoot and demonstrates how to hold the bow, if needed. Have a shooting line they can straddle so someone doesn't get in front or behind someone else. For very small children, you may have to help them pull back the bow.
Be alert for the unexpected. It is possible that a child may swing the bow around and point it at someone else when they are talking with someone to the side or behind them. Once we had a small child shoot at a balloon that was drifting by on the ground. Be ready to grab the bow, particularly after 25 participants have shot without problems, and you think everything is going fine.
No one is allowed near the shooting line except for the participant and the observer, except for maybe a parent who wants to take a photo. Make sure to keep your eyes on the shooter and not the parent when you are answering the parent's questions.