Halloween Event 2008

For this event, you first have to speak to Maggie just east of the crafting guild, then run about draynor and port sarim, right clicking NPCs and selecting trick or treat. First of all however, you need to speak to Wendy for a costume, or use the chicken / skeleton outfit from previous years. It takes a while, and you will get more of some candies than you need, just keep trying.

You will eventually be rewarded with a 3 piece costume, shown here with the new emote unlocked.