Oops, it doesn't look like 'referendum within a week and produce a result on the same day' is a national day..

Other days

Boy Friend Day

Bow Tie Day

Donate Your Hair Day

Hot Chocolate Day

Cuddle Up Day

Promposal Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Ormille Day

Gum Day

Chocolate Milkshake Day