Oops, it doesn't look like 'send me a check day' is a national day..

Other days

book

Book Day
lumpy rug

Lumpy Rug Day
bow tie

Bow Tie Day
ride the wind

Ride The Wind Day
boba

Boba Day
bonang

Bonang Day
ormille

Ormille Day
gallery

Gallery Day
brow

Brow Day
polyamory

Polyamory Day