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

Other days

nae nae

Nae Nae Day
one

One Day
eat what you want

Eat What You Want Day
book

Book Day
lash

Lash Day
donate your hair

Donate Your Hair Day
hot chocolate

Hot Chocolate Day
boba

Boba Day
offer

Offer Day
unicorn

Unicorn Day