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

Other days

lumpy rug

Lumpy Rug Day
tulip

Tulip Day
ruby

Ruby Day
slime

Slime Day
kiss a ginger

Kiss A Ginger Day
nail polish

Nail Polish Day
pumpkin

Pumpkin Day
buddy

Buddy Day
ponytail

Ponytail Day
bow tie

Bow Tie Day