Once a cable is labeled, inserted into a channel, traced, and working, leave it there. Your stage manager can help keep tabs on the bands and gather information to help sound people make quick plots of each performing band. These plots create efficient and easy stage changes for the techies and deck hands. Set your stage for this band first. This assures that you are certain to have the correct sound for the band that will bring in the biggest crowd.
National acts are a different ballgame from local acts.
Security will be an issue. Make sure you have plenty of authorities on hand when a national act is about to appear. Crowds will rush the stage, as well as try to get backstage. Don't become mesmerized by being in the presence of a well-known performer. Consider it an honor.