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

Other days

nae nae

Nae Nae Day
ride the wind

Ride The Wind Day
martini

Martini Day
self care

Self Care Day
kale

Kale Day
slime

Slime Day
boy friend

Boy Friend Day
youth

Youth Day
cursing

Cursing Day
lumpy rug

Lumpy Rug Day