Oops, it doesn't look like 'historical site on the same day' is a national day..

Other days

Fiancee Day

Chocolate Milkshake Day

Boba Day

Polyamory Day

Unicorn Day

Lost Sock Memorial Day

Offer Day

Appreciate Yaself A Lil Extra Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Azonto Is Acceptable Day