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

Other days

reading

Reading Day
kale

Kale Day
ponytail

Ponytail Day
gum

Gum Day
hannah

Hannah Day
bow tie

Bow Tie Day
tell a fairytale

Tell A Fairytale Day
pumpkin

Pumpkin Day
bubble bath

Bubble Bath Day
lisp

Lisp Day