There are many ways one can enjoy fighting, and in my mind the most important role is that of field marshal. They are the ones ensuring combatants are being as safe as possible as well as those around the combatants.
Did you know you do not have to be an authorized fighter to be a rapier field marshal? A number of people volunteer their time to help run tournaments and melees while not ever fighting. If you are interested, please come see me this Wednesday night at Citadel raper practice, I will be starting training for those interested in getting their rapier field marshal authorizations before Hastilude.
Besides the kingdom and society handbooks, this site http://moondragon.info/wiki/Basic_Field_Marshalling has some good points that are worth reading