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

Other days

polyamory

Polyamory Day
brow

Brow Day
healing

Healing Day
pumpkin

Pumpkin Day
ruby

Ruby Day
slime

Slime Day
self care

Self Care Day
buddy

Buddy Day
singles

Singles Day
blanket fort

Blanket Fort Day