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

Other days

fiancee

Fiancee Day
polyamory

Polyamory Day
singles

Singles Day
nail polish

Nail Polish Day
ask out your crush

Ask Out Your Crush Day
buddy

Buddy Day
bow tie

Bow Tie Day
ruby

Ruby Day
self care

Self Care Day
kale

Kale Day