Oops, it doesn't look like 'river day' is a national day..

Other days

Lumpy Rug Day

Promposal Day

Blanket Fort Day

Chocolate Milkshake Day

Appreciate Yaself A Lil Extra Day

Gum Day

Boyfriend Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Donate Your Hair Day

Get Funky Day