I would also agree that a concert environment that is rife with alcohol is not a good idea with only a month of sobriety.
The key to lasting sobriety, in my humble opinion, is to place it practically above all else. I only state this because I personally quit from a state of utter desperation, and frankly had no other choice. Put your sobriety first, and back out from the concert; down the line you'll realize you gave yourself a great gift.
Kind regards.