Oops, it doesn't look like 'why do you even need a specific named day' is a national day..

Other days

Comfy Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Tell Ur Crush You Like Them Day

Pick Me Day

Martini Day

Tulip Day

Me Day

Appreciate Yaself A Lil Extra Day

Hot Chocolate Day

Ponytail Day