Goodfeller's tour?

Hello,

I'm a 13-year-old girl (14 next month) and I want to go to the Goodfellers tour on December 21st with Skandal, Farid, Capo, and Bobby with a few of my cousins, but I read that the tour is for ages 16 and up. One of my cousins ​​is 16, one is 18, and one is 21. Could I go with a note from my parents stating that they are my escorts so that I can go to the concert? It took me ages to persuade my parents to go to the concert, and it would be really bad if I wasn't allowed to. So can I go with a note from my parents?