One of the best but least known holidays

It's "Best Butts in Buttzville, 2017, the fifth installment of same"!

Where?: Buttzville, New Jersey on Route 46 near the intersection with route 31 in Warren County.

When?: August 27, 2017

What?: Seriously? This is a question?

HERE IS A HINT

So get your butt to Buttsville on August 27th and enjoy the cheeky festivities!