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

Other days

tell a fairytale

Tell A Fairytale Day
get funky

Get Funky Day
book

Book Day
slime

Slime Day
eat what you want

Eat What You Want Day
comfy

Comfy Day
boyfriend

Boyfriend Day
carpenters

Carpenters Day
one

One Day
china

China Day