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

Other days

fiancee

Fiancee Day
bow tie

Bow Tie Day
brow

Brow Day
kiss a ginger

Kiss A Ginger Day
cursing

Cursing Day
pick me

Pick Me Day
kale

Kale Day
carpenters

Carpenters Day
pumpkin

Pumpkin Day
blanket fort

Blanket Fort Day