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

Other days

gum

Gum Day
nail polish

Nail Polish Day
blanket fort

Blanket Fort Day
bubble bath

Bubble Bath Day
pumpkin

Pumpkin Day
kale

Kale Day
cursing

Cursing Day
stud

Stud Day
first love

First Love Day
lisp

Lisp Day