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From October 18th to November 1st, it’s your chance to go trick-or-treating across Azeroth.
Visit inns in Azeroth, Northrend, Pandaria, Outland, Draenor and the Broken Isles to get Tricky Treats, and use them to purchase items such as:
If you’re still trying to get your hands on the 
Headless Horseman’s Mount, queue up for The Headless Horseman encounter in your Dungeon Finder. And if you enjoy collecting achievements, there are 21 Hallow’s End exclusive achievements that are obtainable for a limited time.
For more information about the event, check out the official blizzard post.
Headless Horseman’s Hearthstone
Horse Head Costume and 
Horse Tail Costume
Exquisite Costume Set: “The Lich King”