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

Other days

lash

Lash Day
nae nae

Nae Nae Day
buddy

Buddy Day
law

Law Day
healing

Healing Day
tulip

Tulip Day
hoodie

Hoodie Day
brow

Brow Day
believe

Believe Day
offer

Offer Day