Oops, it doesn't look like 'betray ur mutuals day' is a national day..

Other days

Chocolate Milkshake Day

Appreciate Yaself A Lil Extra Day

Ruby Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Latina Equal Pay Day

Offer Day

Lisp Day

Lumpy Rug Day

Healing Day

Polyamory Day