What games have christmas events?

Dota 2 does. I dunno which else.

TF2, Payday 2.

Cave Story

Psychonauts, Costume Quest

Terraria on the iPad and Kindle... Not sure if it's coming to the PC version. I hope so.

Killing Floor.

I remember getting some Christmas achievements two years ago, forgot most of the games though. Here's all I can remember:

DEFCON "Merry Christmas"

E.Y.E: Divine Cybermancy "The Gift"

League has Snowdown, but that's certainly not Steam related.

EDGE has hidden snowflakes as well. And RUSH has hidden presents.

Both are made by Two Tribes, like Toki Tori

Dino D-Day

A Virus Named TOM has free DLC that adds decorations and achievements.

Awesomenauts levels have snow and decorations.

Let's make a list of holiday games

Saints Row IV?

is that all of them?

world of warcraft

Anomaly Warzone Earth has an xmas event where you have to pick up 20 gifts (easily done on any early quest)

Pretty much all of the mmorpg's

Contagion