Oops, it doesn't look like 'joke until the day' is a national day..

Other days

chocolate milkshake

Chocolate Milkshake Day
camera

Camera Day
ride the wind

Ride The Wind Day
boyfriend

Boyfriend Day
self care

Self Care Day
kale

Kale Day
nae nae

Nae Nae Day
cat girl

Cat Girl Day
self appreciation

Self Appreciation Day
bow tie

Bow Tie Day