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

Other days

law

Law Day
lash

Lash Day
ponytail

Ponytail Day
hannah

Hannah Day
nail polish

Nail Polish Day
lost sock memorial

Lost Sock Memorial Day
camera

Camera Day
first love

First Love Day
cursing

Cursing Day
my little pony

My Little Pony Day