Chaperones, also known as matrons, must accompany any child under school-leaving age who is working in a performance. As a chaperone, you are responsible for ensuring the child's welfare during their employment as a performer. You will act in loco parentis (meaning that you exercise the care which a good parent might be reasonably expected to give that child), and the child will be in your care at all times that they are not with a parent or tutor.
As a chaperone, you are employed by the person or company who is producing the performance, but your first priority should be to the child. You become the key person that the child looks to for guidance, protection, clarification and support. This covers any aspect of the child's role and conditions of employment. For example, you may need to negotiate with the production company to make sure that they don't make demands which could harm the child's health, wellbeing, or ability to continue their education while working.