Each year what happens has been slightly diferent, depending on the venue and who turns up. Friday night has tended to be everyone together, although the new layout of the pub may make people spread out further. There has usually been ome form of music playing session on the Saturday afternoon and another on the evening. Some folks pay a passing visit such as you plan to, so could be at either. There should be music happening and if not you could start it up and others will join in.
Quack!
GtD.