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

Other days

gum

Gum Day
girl friend

Girl Friend Day
aloxolt

Aloxolt Day
pampering

Pampering Day
bounce

Bounce Day
kiss a brunette

Kiss A Brunette Day
my little pony

My Little Pony Day
offer

Offer Day
kale

Kale Day
buddy

Buddy Day