Oops, it doesn't look like 'nobody text back day' is a national day..

Other days

pampering

Pampering Day
youth

Youth Day
eat what you want

Eat What You Want Day
bow tie

Bow Tie Day
bounce

Bounce Day
stud

Stud Day
lash

Lash Day
polyamory

Polyamory Day
believe

Believe Day
nail polish

Nail Polish Day