One of the one things I loved about WoW was the transformation of the cities to reflect the popular holidays. Now it looks like we’ll be able to enjoy the same thing in Guild Wars 2.
In addition to trick or treating, PVP Paid Tournaments will be added.
PvP Paid Tournaments
Paid tournaments will be available for competitive, five-person teams. These tournaments require tickets to enter and give better prizes than normal tournaments. Participating teams will earn qualifier points that will allow them to compete in future, larger tournaments. Tournament tickets can be earned from winning normal tournaments or purchased in the Gem Store.
Time to get your skills fine tuned, before you go home crying to mommy that someone finished you off on the battle field.
https://www.guildwars2.com/en/events/halloween-2012