Halloween

The celebration of Halloween is where Kakos Industries pulls out the big guns. So far there are four Halloween episodes. There are also others that mention the festival itself.
A description of a week long Halloween celebration41 - Aftermath:
* Day 1 - Witches
* Day 2 - Pumpkins
* Day 3 - Demons
* Day 4 - Dress As The Thing You Hate
* Day 5 - Lingerie
* Day 6 - Candy Corn
* Day 7 - Totally Insane
Halloween
Halloween II
Halloween III
Halloween IV