I don't know what is being represented here, it looks festive but probably isn't.

I have been informed it is from Nevali Cori. I found a link to a site with information about Göbekli Tepe (a fascinating spot that I'd love to visit one day) and Nevali Cori. About Nevali Cori it said: "At Nevali Cori, the local limestone was carved into numerous statues and stele, including a more than life-sized bare human head with a snake or sikha-like tuft, (sikha- a long tuft, or lock of hair left on top or on the back of the shaven head). There is also a statue of a bird. Some of the pillars also have carved relief's, including human hands. The free-standing anthropomorphic figures (attribution of human characteristics to non-human creatures), which are made of limestone, are Comparable to sculptures found at Göbekli Tepe; together they are the oldest known life-sized sculptures."