Holidays for Everyday) and Mayflower Day (according to darn near all of the Usual Suspects).
Today is Mayflower Day because it was on this day in 1620 that the Mayflower set sail from England.
None of our ancestors were aboard. More than likely, none of yours were either.
That's why we here at The Blog of Days are more inclined to celebrate the birthday of that self-proclaimed Super Genius Wile E. Coyote today.
But there is a potential problem. The Wikipedia article on Wile E. Coyote (from whence the accompanying image was obtained) says that Wile E. Coyote and his nemesis, Road Runner, made their cartoon debut on September 17, 1949 in the Warner Brothers short "Fast and Furry-ous." On the other hand, tomorrow is Constitution Day, and that would have preempted Messrs. Coyote and Runner anyway.
Gone-ta-pott suggests that today is Wife Appreciation Day -- but, as every married man (in his right mind) knows, every day is Wife Appreciation Day. (Quickly, men, nod in agreement....)