Oops, it doesn't look like 'ParkGood Morning And Happy Hump day' is a national day..

Other days

Stress Awareness Day

Nae Nae Day

My Little Pony Day

Eat What You Want Day

Me Day

Prosecco Day

Tell Ur Crush You Like Them Day

Embarrass Your Best Friend Day

Donate Your Hair Day

Polyamory Day