[EVENT] MERRY X-MAS Sticker Collection Event The Holiday season is near! Merry X-Mas Sticker Event is back!
http://forums.playredfox.com/index.php?threads/event-merry-x-mas-sticker-collection-event.39622/
[EVENT] MERRY X-MAS Sticker Collection Event
Source: Steam Community (opens in a new tab)