If you already have an AQ3D account, go to Battleon and talk to the Concert Promoter in Mosh Pit Marauder armor or Zea Maize at the Travel Crystal. 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 on August 20th, 2019.
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 Shard.