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

Other days

first love

First Love Day
tulip

Tulip Day
kale

Kale Day
prosecco

Prosecco Day
one

One Day
buddy

Buddy Day
lisp

Lisp Day
kiss a brunette

Kiss A Brunette Day
azonto is acceptable

Azonto Is Acceptable Day
boba

Boba Day