Aion official forum recently announced that the single-elimination PvP tournaments named "Battle of Kahrun" will be held on the 1st of Decemeber. The lack of organized PvP from the game made the players organize this PvP tournament. NCSoft has donated enchantment stones, a special plushie and NC coins that will ultimately be awarded to the winner.
How to Join the Battle of Kahrun: It is a simple process which should take no longer than 5minutes. Create and account at this page. Once you have created an account head here, create a team name with your "IN-GAME NAME". Any team names that do not have your In-game name in it will be removed from the tournament.
Check out all of the details about the tournament on the Aion forums or at the links above.