Oops, it doesn't look like 'listen to in utero on repeat and cry yourself to sleep day' is a national day..

Other days

Eat What You Want Day

Kiss A Brunette Day

China Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Stud Day

Tulip Day

Blanket Fort Day

Bow Tie Day

Reading Day

My Little Pony Day