Oops, it doesn't look like 'clean up the world day' is a national day..

Other days

kale

Kale Day
lumpy rug

Lumpy Rug Day
cuddle up

Cuddle Up Day
carpenters

Carpenters Day
comfy

Comfy Day
lisp

Lisp Day
believe

Believe Day
blanket fort

Blanket Fort Day
gum

Gum Day
boy friend

Boy Friend Day