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

Other days

law

Law Day
tulip

Tulip Day
donate your hair

Donate Your Hair Day
boba

Boba Day
slime

Slime Day
lash

Lash Day
brow

Brow Day
tell a fairytale

Tell A Fairytale Day
nail polish

Nail Polish Day
china

China Day