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

Other days

bounce

Bounce Day
polyamory

Polyamory Day
boba

Boba Day
buddy

Buddy Day
bow tie

Bow Tie Day
pampering

Pampering Day
ride the wind

Ride The Wind Day
aloxolt

Aloxolt Day
nae nae

Nae Nae Day
stress awareness

Stress Awareness Day