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

Other days

Appreciate Yaself A Lil Extra Day

Promposal Day

Chocolate Milkshake Day

Tell A Fairytale Day

Buddy Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Lost Sock Memorial Day

Unicorn Day

Self Care Day

Frozen Yogurt Day