Oops, it doesn't look like 'slide in yo ex phone day' is a national day..

Other days

bonang

Bonang Day
boy friend

Boy Friend Day
offer

Offer Day
kiss a ginger

Kiss A Ginger Day
mean girls

Mean Girls Day
cuddle up

Cuddle Up Day
china

China Day
ponytail

Ponytail Day
book

Book Day
one

One Day