Oops, it doesn't look like 'move on stalking your ex day' is a national day..

Other days

hoodie

Hoodie Day
kiss a brunette

Kiss A Brunette Day
blanket fort

Blanket Fort Day
china

China Day
law

Law Day
lisp

Lisp Day
brow

Brow Day
pick me

Pick Me Day
hannah

Hannah Day
lumpy rug

Lumpy Rug Day