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

Other days

brow

Brow Day
pumpkin

Pumpkin Day
blanket fort

Blanket Fort Day
artists

Artists Day
ponytail

Ponytail Day
frozen yogurt

Frozen Yogurt Day
believe

Believe Day
pick me

Pick Me Day
cuddle up

Cuddle Up Day
kiss a ginger

Kiss A Ginger Day