Should you let your teen go to a festival with their friends?

Should parents let their teens go to a festival with friends — and what do you need to be asking if they do go?
Going to your first festival with friends should be exciting, rewarding and fun, making it one of the highlights of the summer holiday.
But if your teen hasn’t spent much time away from home, or travelled long distances without any adult supervision before, it’s understandable some parents could be in two minds about letting them go.