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

Other days

tulip

Tulip Day
brow

Brow Day
bubble bath

Bubble Bath Day
kale

Kale Day
nae nae

Nae Nae Day
bow tie

Bow Tie Day
carpenters

Carpenters Day
cuddle up

Cuddle Up Day
pampering

Pampering Day
cat girl

Cat Girl Day