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

Other days

bounce

Bounce Day
nae nae

Nae Nae Day
believe

Believe Day
one

One Day
coffee

Coffee Day
donate your hair

Donate Your Hair Day
martini

Martini Day
boba

Boba Day
lost sock memorial

Lost Sock Memorial Day
tulip

Tulip Day