Roger Waters is a living legend, but he's getting old, and this might be his last tour. If you see 'The Wall Live' you're going to remember it for the rest of your life.
I saw Emerson, Lake & Palmer live when I was thirteen (my first arena show). There was weed all over the place, but nobody was offering me any. (When you get older you realize that drug users don't just offer drugs to random teenagers - it's extremely bad etiquette. It makes you look like you really don't care if you get busted or if you screw up some kid's life. And ABSOLUTELY NOBODY is dealing at an arena show.) I didn't even think about weed for the next six years.
Ask your dad to go with you!