You should all already know this thanks to the new in-game calendar, but Hallow's End, the annual World of Warcraft Halloween event, kicks off tomorrow and continues until Nov. 1.

You'll be able to collect treat bags from innkeepers, purchase sweets from vendors, participate in the Wickerman Festival outside the Undercity, help take down the Headless Horseman, run around wearing those flimsy masks, or change your party members' appearance with a magic wand. Oh, and level 51-60 humanoid monsters have a chance to drop a rare 16-slot bag. Elite monsters have the highest drop rate.

For more information, check out the guide on the official WoW site.