December 5 is Repeal Day: a day to commemorate and celebrate the anniversary of the day the Eighteenth Amendment was repealed and Americans gained the right to drink alcohol.
Repeal Day has its own website where you can find a history of Prohibition and text from the 18th and 21st amendments.
The Repeal Day celebration is the brainchild of Jeffrey Morgenthaler, who makes a great case for why December 5 should be a national drinking holiday. Other holidays such as St. Patrick's Day and Cinco de Mayo- which have no true connection to alcohol- are commonly considered "drinking holidays," so why not Repeal Day? Jeffrey provides a great list of reasons for celebrating on his blog. (Not that you need a reason.)
It's not as much fun to fall on a Sunday this year, but you can still celebrate Repeal Day.