For me, metal concerts and drinking went hand and hand. It was over two years before I felt strong enough to go to a concert and not struggle with the urge to drink. Saw Opeth. And I was fine. But I was also strong in my recovery and knew I would be okay.
You, however, sound like you have doubts. And no wonder. You've only been sober since January. If live, heavy metal music is a trigger, I would urge caution...caution in the form of not going. Wait and attend Carolina Rebellion 2016.