Oops, it doesn't look like 'museum of natural history will be conducting a day' is a national day..

Other days

Bubble Bath Day

African Immigrant And Refugee Hiv And Hep Awareness Day

First Love Day

Chocolate Milkshake Day

Promposal Day

Ride The Wind Day

Lisp Day

Donate Your Hair Day

Frozen Yogurt Day

Nail Polish Day