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

Other days

gum

Gum Day
boy friend

Boy Friend Day
prosecco

Prosecco Day
eat what you want

Eat What You Want Day
law

Law Day
ponytail

Ponytail Day
ruby

Ruby Day
lumpy rug

Lumpy Rug Day
ormille

Ormille Day
nae nae

Nae Nae Day