Starting this week, holiday events for the 2015 winter season are being posted in the Events section. Participating in at least 4 events will earn you a lovely new medal. To receive your medal, message a mod (pink or green titles) with links to your 4 posts.
Currently, there are 6 events open. All of the events listed below will count towards the medal:
Holiday Screenshot
Snowman Building
Snowflake Decorating
Holiday Word Search
Holiday Wishlist
New Year's Resolutions
In addition to the medal events, there's also a winter-themed Let's Build It, and 12 Smiley Days of Christmas.