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

Other days

boy friend

Boy Friend Day
first love

First Love Day
coffee

Coffee Day
lash

Lash Day
self care

Self Care Day
believe

Believe Day
offer

Offer Day
comfy

Comfy Day
ask out your crush

Ask Out Your Crush Day
martini

Martini Day