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

Other days

cat girl

Cat Girl Day
kiss a brunette

Kiss A Brunette Day
unicorn

Unicorn Day
tell a fairytale

Tell A Fairytale Day
lisp

Lisp Day
kale

Kale Day
youth

Youth Day
kiss a ginger

Kiss A Ginger Day
self care

Self Care Day
law

Law Day