Depends on how longsober you are. If you are in the early weeks I would honestly not go. There will always be other concerts. Whilst some may say you can't avoid alcohol forever you can try your best to avoid it in the difficult early weeks and not put yourself in painful situations which may well compromise your sobriety
Be honest with yourself. Do you really think you will go to a booze drenched concert and not drink? Do you think you'll feel comfortable not drinking? Will your friends all be drinking,patting you on the back and say oh go on mater just have a beer? will you?