Dd18 went to Reading last year (never ever seen Reading as busy as midnight on festival weekend it was crazy), I picked her up one night and she stayed with friends in Reading the other. Post-GCSEs I said absolutely no to camping, but we are close enough to pick up, in the end she thought it too expensive that year.
The thing with Reading is they go in large, often single sex groups and they drink a lot, and because it’s mainly kids in their late teens they do stupid things, particularly in the campsite after the entertainment has finished.
DS not really got a group to go with this year, but I would say the same as to his older sister, fine but no camping.