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

Other days

lisp

Lisp Day
first love

First Love Day
girl friend

Girl Friend Day
cursing

Cursing Day
lumpy rug

Lumpy Rug Day
nae nae

Nae Nae Day
stud

Stud Day
ruby

Ruby Day
polyamory

Polyamory Day
aloxolt

Aloxolt Day