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

Other days

believe

Believe Day
get funky

Get Funky Day
stud

Stud Day
ruby

Ruby Day
boba

Boba Day
donate your hair

Donate Your Hair Day
comfy

Comfy Day
bubble bath

Bubble Bath Day
self care

Self Care Day
boy friend

Boy Friend Day