Not an official holiday of course, but today is being celebrated by many as "clean your refrigerator out day":
http://www.holidayinsights.com/moreholi ... torday.htm
Ugh, that's a chore to do sometimes.
And, sometimes you never know what you might find in there.
However, it might be a good idea to make some extra room in the fridge for all those upcoming Thanksgiving Day leftovers.