Today is the Winter Solistice!

Today is the winter solstice. The sun has halted its northerly trek and is headed back toward the equator for the spring equinox. Atheists, what are you doing in celebration today? ;-) And what do you do on the Summer Solstice (June 24th)? Why celebrate one rather than the other? And why even do it when we no longer worship the sun? I just celebrate having family and friends during this season.