I've always been a mustard instead of mayo kind of gal. So I was super-excited to learn that there's a National Mustard Day - a day that actually has a traceable history! National Mustard Day is nearing the quarter-century mark and is celebrated in great fashion by the Mustard Museum in Middleton, Wisconsin. There's even a parade every year! Now that I know this, I will have to go.
Have a little history on the condiment itself. Global Gourmet even provides recipes with the history of mustard.