From YPPedia

The 2005 Halloween events began with the introduction of modified clothing hat "masks" on October 25, 2005, and concluded with their removal on November 3, 2005. The highlight of the Halloween events was the Zombie Apocalypse event that took place between October 29 and October 31.

Masks

A notable feature of the 2005 Halloween celebration was the return of mask hats, which debuted in 2004. New portrait art and a new portrait background were also introduced to commemorate them. The men's musketeer hat, the women's muffin hat, and both sexes' savvy hat did not have any unusual effect. Additionally, the women's feathered hat only appeared as different in portraits, and pirates without hats saw no additional effect.

Male Masks
Bandana		Captain's hat		Conquistador helmet
Crown		Feathered Hat		Sleeping Hat
Tricorne		Turban
Female Masks
				Not shown in game
Bandana		Captain's hat		Feathered hat
Laurel		Scarf		Tiara
Tricorne		Wide-brimmed hat

Zombie Apocalypse

During the first part of October 29, players could be infected by other players and turn into zombies. When this happened, portraits featuring the infected player showed the zombified version of him or her. All zombies had different hair and skin colors based upon their original pre-infection colors. Instead of the usual selection of eyes and mouth expressions, zombie players always had wide, red eyes and an open mouth with rotten teeth. Masquerade masks were still available to wear.

By the evening, the Zombie Apocalypse had begun. All players were divided into seven hordes of zombies upon logging into the game. Each time a player took part in a 1-on-1 challenge versus another player, the results were recorded and tallied toward the weekend total for each horde. The standings for each horde were regularly tallied and updated on a special "Competition!" tab of the notice board. At the conclusion of the Zombie Apocalypse, which was around 1 a.m. Pirate Time on November 1, the winning team members were awarded "Golden Brains." Each participating member on all teams received an award, which took the form of an untradeable trinket. Each trinket was a body part, supported by a colored zombie arm based on the color of the team which won that award.

During the Zombie Apocalypse, players could not wear hats, restricting the special Halloween masks. All pirates had black hair and skin the same color as their team.

If a player wished to opt-out of being a zombie for reasons of personal belief, he or she could be given a Cure-all elixir potion by an Ocean Master by requesting one in a petition. Cure-all elixirs also removed all injuries, however, and needed to be taken every time a pirate logged on.

Results

The competition results are detailed below.

2005 Zombie Apocalypse

Standing	Cobalt	Midnight	Sage	Viridian	Prize
First	Night Stalkers	Gangrenous Ghouls	Pustulent Horde	Night Stalkers	Golden brain
Second	Bone Cleaners	Putrid Shamblers	Gangrenous Ghouls	Bone Cleaners	Silver heart
Third	Blood Hungry	Pustulent Horde	Bone Cleaners	Pustulent Horde	Bronze stomach
Fourth	Brain Biters	Blood Hungry	Putrid Shamblers	Blood Hungry	Intestines
Fifth	Putrid Shamblers	Bone Cleaners	Blood Hungry	Putrid Shamblers	Kidneys
Sixth	Gangrenous Ghouls	Brain Biters	Brain Biters	Brain Biters	Liver
Seventh	Pustulent Horde	Night Stalkers	Night Stalkers	Gangrenous Ghouls	Foot

Combining the ocean scores, and assigning 7 points for a win all the way down to 1 point for last place, gives the following final scores:

Position	Team	Points
First	Bone Cleaners	20
Second	Pustulent Horde	18
Third to Sixth tie	Blood Hungry	16
	Gangrenous Ghouls
	Night Stalkers
	Putrid Shamblers
Seventh	Brain Biters	10

Team Competitions
2005:			Zombie Apocalypse
2006:			Fight Club
			Foot Brawl 2006
			Arrrmageddon
			Santa Rampage!!!
2007:			Ye Dread Dead
			Reindeer Games
2008:			Pirate Summer Games
			Trick-ARRR-Treat
			Yuletide Bake-Off
2009:			Rise of the Vampirates
			A Pirate Carol
2010:			Pirate Winter Games