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

Other days

boba

Boba Day
gum

Gum Day
ride the wind

Ride The Wind Day
nae nae

Nae Nae Day
offer

Offer Day
donate your hair

Donate Your Hair Day
lash

Lash Day
bounce

Bounce Day
pumpkin

Pumpkin Day
stud

Stud Day