Wikipedia Article: http://en.wikipedia.org/wiki/Community_Manager_Appreciation_Day

Community Manager Appreciation Day takes place every 4th Monday of January as a way to recognize and celebrate the efforts of community managers around the world using social media to improve customer experiences.

People are encouraged to send sincere Thank You notes to their online community managers. People using Twitter include the #CMAD and #CMGR hashtag in their tweets about this event. Many online community managers and vendors in thesocial media marketplace post blogs in appreciation of their community managers. Cities with large concentrations of Social Media focused businesses, such as Boston, Austin, and San Francisco hold in-person meetup events to celebrate and honor those who represent and support their online communities.