Oops, it doesn't look like 'girl group title as rookies and still be called that to this day' is a national day..

Other days

Kale Day

Pick Me Day

Stress Awareness Day

Ask Out Your Crush Day

Kiss A Brunette Day

Chocolate Milkshake Day

Frozen Yogurt Day

Self Appreciation Day

Appreciate Yaself A Lil Extra Day

Believe Day