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

Other days

gum

Gum Day
prosecco

Prosecco Day
lash

Lash Day
bow tie

Bow Tie Day
artists

Artists Day
unicorn

Unicorn Day
eat what you want

Eat What You Want Day
cat girl

Cat Girl Day
china

China Day
book

Book Day