Oops, it doesn't look like 'celebrations of international day' is a national day..

Other days

frozen yogurt

Frozen Yogurt Day
boy friend

Boy Friend Day
bow tie

Bow Tie Day
cursing

Cursing Day
eat what you want

Eat What You Want Day
prosecco

Prosecco Day
pumpkin

Pumpkin Day
me

Me Day
ride the wind

Ride The Wind Day
ponytail

Ponytail Day