Oops, it doesn't look like 'highway construction completed in a day' is a national day..

Other days

Ponytail Day

Chocolate Milkshake Day

Pumpkin Day

Tulip Day

Blanket Fort Day

Gum Day

Appreciate Yaself A Lil Extra Day

Me Day

Emoji Day

African Immigrant And Refugee Hiv And Hep Awareness Day