<p><strong>Winter Bash</strong> is a special celebration that typically runs from December 15th until January 4th each winter (2012, 2013, 2014, and almost certainly beyond).</p>

<p>Users who participate earn hats for their avatar, via various acts on Cross Validated SE.</p>

<p><sub>Reference: imported excerpt and adapted wiki from the main <a href="http://meta.stackexchange.com/tags/winterbash/info">Meta Stack Exchange</a> site.</sub></p>
