Oops, it doesn't look like 'wwii museum solemnly joins with the entire world in commemorating international holocaust remembrance day' is a national day..

Other days

Book Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Stud Day

Hannah Day

Azonto Is Acceptable Day

Polyamory Day

First Love Day

Get Funky Day

Embarrass Your Best Friend Day

Blanket Fort Day