hehe.....I still remember that time as a teenager and am not looking forward to dealing with teenage boys and driving, though no girls. My oldest is 4yo and I'm already of the mind that unless they bought their own car, are paying their own insurance rates and are paying for the whole trip on their own, they can't go outside of town unless mom or dad is with them. I think that kids need to understand what driving really means and that means the WHOLE thing (including the $$ responsibility behind it).
I was reading somewhere that depending on how long your child has had their license, they can not ride with anyone under 20 yo unless accompanied by a licensed driver 25 yo or older and are not allowed to drive between 11pm and 5am. So that law might enable you to say NO right away anyway =)
You are the parent and it's up to you. Maybe you can go with them to the concert next time if planned in advance???
But the financial responsibility of owning a car often curbs where they want to go and how reckless they drive in order to maintain reasonably priced insurance.
Good luck!!!!