Oops, it doesn't look like 'pain in my ass day' is a national day..

Other days

tulip

Tulip Day
ponytail

Ponytail Day
gum

Gum Day
first love

First Love Day
artists

Artists Day
bonang

Bonang Day
self care

Self Care Day
bow tie

Bow Tie Day
ormille

Ormille Day
azonto is acceptable

Azonto Is Acceptable Day