Oops, it doesn't look like 'hungover at work day' is a national day..

Other days

Fiancee Day

Kale Day

Ormille Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Appreciate Yaself A Lil Extra Day

Emoji Day

Bow Tie Day

Tell Ur Crush You Like Them Day

Tulip Day

Brow Day