There seems to be a lot of national days and weeks and months. It was national postcard week may 4-10, 2014. I sent out the postcards above. It's a good thing I have a stash of postcards for such an occasion.
April was National Letter Writing Month. January 23 is National Handwriting Day.
National Donut Day just passed- it was delicious. Who is setting these days, I wonder? July 1st is both the national postal worker day and the US postage stamp day. See more here.