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

Other days

healing

Healing Day
lash

Lash Day
carpenters

Carpenters Day
ponytail

Ponytail Day
coffee

Coffee Day
azonto is acceptable

Azonto Is Acceptable Day
pumpkin

Pumpkin Day
nail polish

Nail Polish Day
boy friend

Boy Friend Day
offer

Offer Day