Sometimes they listen to headphones to zone out the noise of other people. My daughter reviewed the requirements for next audition to make sure she had the right music queued up and didn’t select the wrong cut, as each school can have slightly different requirements. If they had an accompanist, she made sure she had the right music in her “skinny binder” that she handed the person. She also reviewed a “key features and pros/cons” list she had for each school in case they asked questions or got into a discussion. She stretched to keep herself ready for dance calls. Or, we went and got lunch.