How it is Halloween?

[simple copper]

How is the Halloween event working? I would like to know about the rules, the chances of winning an item, etc.

[neat warren]

October event item/rarity list
Skeleton Skull: 1/4000
Jack O Lantern: 1/4000
Pumpkin: 1/2000
Spider Web: 1/500
Candy Corn: 1/500
KitKat: 1/500
Crunch Bar: 1/500
Empty Candy Wrapper: 1/100
Will O Wisp: 1/99999
Pumpkin Pie: 1/4000

Just the Villager Bot rules