Oops, it doesn't look like 'end every sentence with a song day' is a national day..

Other days

African Immigrant And Refugee Hiv And Hep Awareness Day

My Little Pony Day

Promposal Day

Boba Day

Ask Out Your Crush Day

Lost Sock Memorial Day

Appreciate Yaself A Lil Extra Day

Prescription Drug Take Back Day

Stud Day

Pumpkin Day