It's Darwin's birthday (the notorious, mild-mannered Anglican clergyman who wrote books about natural selection).
It's also Lincoln's birthday (the American president noted particularly for his gaunt looks, top hat, and love of jokes).
For both of them, the 200th. 1809 was a good year, clearly.
(Personally, I'm most appreciative of the fact that on Lincoln's 200th birthday, a black American is president of the United States.)
I have to figure out what to toast those three fact with--but I have 24 hours still to figure it out. I'm open to suggestions.