Oops, it doesn't look like 'disappear for a couple hours in the middle of the day' is a national day..

Other days

Boy Friend Day

Boba Day

Self Appreciation Day

Pumpkin Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Blanket Fort Day

Kiss A Brunette Day

Special Education Day

Pampering Day

Embarrass Your Best Friend Day