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

Other days

my little pony

My Little Pony Day
tell a fairytale

Tell A Fairytale Day
bow tie

Bow Tie Day
lisp

Lisp Day
hoodie

Hoodie Day
artists

Artists Day
offer

Offer Day
tulip

Tulip Day
stress awareness

Stress Awareness Day
brow

Brow Day