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

Other days

boy friend

Boy Friend Day
unicorn

Unicorn Day
stud

Stud Day
lisp

Lisp Day
boba

Boba Day
blanket fort

Blanket Fort Day
polyamory

Polyamory Day
bow tie

Bow Tie Day
singles

Singles Day
prosecco

Prosecco Day