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

Other days

gum

Gum Day
lash

Lash Day
donate your hair

Donate Your Hair Day
unicorn

Unicorn Day
raise awerness of zeus

Raise Awerness Of Zeus Day
singles

Singles Day
lisp

Lisp Day
first love

First Love Day
ruby

Ruby Day
boy friend

Boy Friend Day