Oops, it doesn't look like 'blue shed day' is a national day..

Other days

get funky

Get Funky Day
unicorn

Unicorn Day
lisp

Lisp Day
hoodie

Hoodie Day
hiv awareness

Hiv Awareness Day
comfy

Comfy Day
kiss a ginger

Kiss A Ginger Day
bubble bath

Bubble Bath Day
blanket fort

Blanket Fort Day
ruby

Ruby Day