When you know you are coming up to a difficult crossing or turn, move up to the front to help out the leader. From time to time, fall back to relieve the end leader. At other times, observe the scouts and make suggestions on how they can improve their riding skills. Some will have already developed bad habits such as riding with their heels on the pedals or weaving. Almost all will start out riding in too high a gear.
Bad habits take time to change into good riding practices.
Many organized ride groups use road calls to communicate various conditions encountered of their rides. This is a good practice which I suggest that you adopt. Given by the end riders, this alerts the rest of the group of any motor vehicle approaching from the rear that is likely to pass. Given by the front rider on lightly traveled or back roads. It is not necessary if the volume of traffic is such that there is usually a car coming from the front.