I suspect a lot of people don't know or don't care about the regulations with regards to people under the age of 18 and "strangers".
They're somewhat onerous (understandably and rightly so), but that does mean that unfortunately a lot of people (myself included) would feel uncomfortable with that sort of responsibility. Some people simply won't attend events involving under-18's for these reasons (especially in cases where their job could be in jeopardy if anything went wrong). There's also the whole pub/drinking thing as Bigstan mentioned.
I don't want to put a downer on this before it's even started, but this is definitely something we'd have to be absolutely sure on if under-18's were allowed.
As for my location, well actually if you remove a few letters you'll get it right.