Oops, it doesn't look like 'curse thoroughly and fluently at inanimate objects day' is a national day..

Other days

Lash Day

Nae Nae Day

Hoodie Day

Bow Tie Day

Gum Day

Prescription Drug Take Back Day

Tell A Fairytale Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Martini Day

Kiss A Brunette Day