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

African Immigrant And Refugee Hiv And Hep Awareness Day

Gum Day

Comfy Day

Embarrass Your Best Friend Day

Slime Day

Carpenters Day

Coffee Day

Donate Your Hair Day

Special Education Day