Oops, it doesn't look like 'shite mood day' is a national day..

Other days

lumpy rug

Lumpy Rug Day
china

China Day
first love

First Love Day
emoji

Emoji Day
my little pony

My Little Pony Day
ride the wind

Ride The Wind Day
brow

Brow Day
blanket fort

Blanket Fort Day
get funky

Get Funky Day
lisp

Lisp Day