Try Alliance Battles!

On the other hand, you might want to bring in your existing PvP characters, or create new ones, to take part in PvP on the Battle Isles. Or you can bring your roleplaying characters to join an alliance battle in Cantha. For alliance battles during the event, your guild will be in its own individual alliance. In the future, naturally your guild will want to ally with others within your faction to create a powerful entity within Cantha. By speaking to your faction ambassador in your capital city, either House zu Heltzer or Cavalon, you can join the battle to help your faction gain control of outposts. The combat is 12 versus 12 consisting of 3 groups of 4 players each playing against one another either collectively or as individual battle squads. The world map will visibly change as alliances conquer more of Cantha with their victories and the winners will be recognized within the game. http://www.guildwars.com/events/ingame/factionspreview.php