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

Other days

ruby

Ruby Day
comfy

Comfy Day
bow tie

Bow Tie Day
law

Law Day
ride the wind

Ride The Wind Day
offer

Offer Day
frozen yogurt

Frozen Yogurt Day
ormille

Ormille Day
cursing

Cursing Day
tulip

Tulip Day