Oops, it doesn't look like 'outrage when greeters at retail stores use day' is a national day..

Other days

Carpenters Day

Buddy Day

Kiss A Ginger Day

Boyfriend Day

Special Education Day

Lost Sock Memorial Day

Bonang Day

Tell Ur Crush You Like Them Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Cat Girl Day