I've been in a similar position 10 years ago when I was 16. I wanted to meet a bunch of friends from Arma 3, in Wrocław as well.

My parents didn't allow me to go. Years later I still hate them for it. I make sure they never know when I leave town now, since I'm not really in the mood to listen to my mom enumerating every way something bad can happen to me.

Let your fucking kid go. Especially when the kid isn't as retarded as you.