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

Other days

pumpkin

Pumpkin Day
tell a fairytale

Tell A Fairytale Day
lisp

Lisp Day
kale

Kale Day
azonto is acceptable

Azonto Is Acceptable Day
cat girl

Cat Girl Day
gum

Gum Day
hoodie

Hoodie Day
bow tie

Bow Tie Day
pick me

Pick Me Day