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

Other days

lisp

Lisp Day
law

Law Day
camera

Camera Day
bow tie

Bow Tie Day
ruby

Ruby Day
lash

Lash Day
eat what you want

Eat What You Want Day
artists

Artists Day
polyamory

Polyamory Day
fiancee

Fiancee Day