People sit in circle. One person, the oya (親、おや､ master of ceremonies), makes a speech, fill his glass, drinks in a sip, then pours awamori for the neighboring person, who has to drink in a sip. And so on until everyone has drunk his cup. Then the oya moves counterclockwise around the circle, and the procedure is repeated.
As you can see people end up drinking a lot and this is probably the reason there are no centenarians men in Miyako.