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

Other days

tulip

Tulip Day
believe

Believe Day
cuddle up

Cuddle Up Day
self care

Self Care Day
nae nae

Nae Nae Day
ask out your crush

Ask Out Your Crush Day
martini

Martini Day
slime

Slime Day
polyamory

Polyamory Day
hoodie

Hoodie Day