If you already have an AQ3D account, go to Battleon and talk to any Concert Promoter on the bridge or at the Travel Crystal in Battleon. From them you can get a concert ticket for free. You can use this ticket to teleport to the show from anywhere in the world once it begins.
If you don’t have an account, no problem. Create a free account and a ticket will automatically be added to your account - but complete the tutorial first, because this event will require some swords and sorcery.
You can also choose to just walk to the Battle Concert Arena from Battleon or teleport with the Travel Crystal.