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

Other days

me

Me Day
eat what you want

Eat What You Want Day
self appreciation

Self Appreciation Day
embarrass your best friend

Embarrass Your Best Friend Day
kale

Kale Day
hiv awareness

Hiv Awareness Day
boy friend

Boy Friend Day
bow tie

Bow Tie Day
tell a fairytale

Tell A Fairytale Day
ruby

Ruby Day