Kids need to know that this is a sanctioned activity of the teachers. Teachers should be encouraged to learn the rules of marbles so that they can motivate their students to excel. Their class champs will be representing their class in the school tournament. The students who excel should be praised for their accomplishments. Because kids want to practice and play marbles, they will excel in other class activities so that they will have more time for marbles.
Marbles can be an integral part of the class.
Co-ordinate play by scheduling games. The jobs given to volunteers will depend on the number of people willing to help. If you have a lot of people, you will be able to assign specific jobs. Otherwise a volunteer might have to do many of the following jobs. A judge must take great care when supervising a game because a judge can influence its outcome.