Oops, it doesn't look like 'friends of the besties day' is a national day..

Other days

brow

Brow Day
blanket fort

Blanket Fort Day
bonang

Bonang Day
tell a fairytale

Tell A Fairytale Day
gum

Gum Day
first love

First Love Day
coffee

Coffee Day
kale

Kale Day
artists

Artists Day
slime

Slime Day