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

Other days

kale

Kale Day
youth

Youth Day
tulip

Tulip Day
girl friend

Girl Friend Day
self care

Self Care Day
unicorn

Unicorn Day
fiancee

Fiancee Day
lisp

Lisp Day
bow tie

Bow Tie Day
prosecco

Prosecco Day