Oops, it doesn't look like 'open throughout the day' is a national day..

Other days

Appreciate Yaself A Lil Extra Day

Get Funky Day

Unicorn Day

Singles Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Kiss A Brunette Day

Slime Day

Lash Day

Frozen Yogurt Day

Raise Awerness Of Zeus Day