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

Other days

book

Book Day
blanket fort

Blanket Fort Day
boy friend

Boy Friend Day
carpenters

Carpenters Day
ruby

Ruby Day
nae nae

Nae Nae Day
unicorn

Unicorn Day
coffee

Coffee Day
buddy

Buddy Day
eat what you want

Eat What You Want Day