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

Other days

book

Book Day
bow tie

Bow Tie Day
eat what you want

Eat What You Want Day
hoodie

Hoodie Day
bubble bath

Bubble Bath Day
lost sock memorial

Lost Sock Memorial Day
boba

Boba Day
lash

Lash Day
stud

Stud Day
china

China Day