Oops, it doesn't look like 'no rivals day' is a national day..

Other days

cursing

Cursing Day
lash

Lash Day
my little pony

My Little Pony Day
camera

Camera Day
polyamory

Polyamory Day
nae nae

Nae Nae Day
bubble bath

Bubble Bath Day
lumpy rug

Lumpy Rug Day
bonang

Bonang Day
hiv awareness

Hiv Awareness Day