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

Other days

lisp

Lisp Day
martini

Martini Day
eat what you want

Eat What You Want Day
boba

Boba Day
bow tie

Bow Tie Day
tell a fairytale

Tell A Fairytale Day
lash

Lash Day
gum

Gum Day
pick me

Pick Me Day
unicorn

Unicorn Day