Too much risk, If you get into a situation where you are not sure what is legal and what isnt and a minor is involved, you can take it as read that if it went to jury some old biddy will decide you where in the wrong.
That assumes a parent would be mad enough to send their kid off to meet not 1 but a crowd of people from the internet, which I sincerely hope they aren't.
Bring a parent with you and all the problems go away.
Seriously, even I didnt turn up to the karting do without taking some precautions and i'm older and better able to protect myself.