It is very important that your 7 year old son wears ear defenders (And a wide range of colourful options are availible for kids too!) therefore its probably sensible that the whole family ear plugs up if only to set a good example.
I did see a lot of people not wearing ear plugs, but its a lot higher pitched that you’d expect. I could cope fine without them and Im a bit of a musician so I have to look after my ears as Im in a loud environment a lot.
Take a good pair of ear phones and some ear plugs and you should be fine. Im contemplating taking cans (big headphones) next time I go.
P.S. Legendary avatar sw6569