Some calendars also list today as National Coq au Vin Day, but as that's also listed as May 29th and I can't find what other food observance day is May 29th, I'm going with today is National Bavarian Crepes Day.
Bavarian crepes are crepes (thin, sweet pancakes) rolled into tubes and filled with Bavarian cream (cream made with gelatin and flavored with liquer). Sometimes the crepes are topped with chocolate sauce or fruit, like blueberry pie filling. Seems simple enough, but again, this is a food I haven't made. I'm not sure if I've had Bavarian crepes. I know I've had crepes, but I can't recall any of them filled with cream.