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

Other days

kale

Kale Day
mean girls

Mean Girls Day
pick me

Pick Me Day
bow tie

Bow Tie Day
brow

Brow Day
cat girl

Cat Girl Day
blanket fort

Blanket Fort Day
kiss a ginger

Kiss A Ginger Day
lisp

Lisp Day
lash

Lash Day