Paligremnos used to have a music night, but it did not bring in enough money so it has stopped. We went to it a few times and really enjoyed it. It was very participatory. On one occasion a greek woman started dancing on a table, with her friends circling round and clapping. The night always involved a lively "Zorbas".
You will see advertised in Plakias music at one of the tavernas at Souda, about 5 km along the coast. There have also been Greek nights at Calypso resort, again out of town.
Last year there was a music night at the campsite in Plakias but for a reason I can't remember, we didn't go.
So in short, I'm being a bit helpful, but not very!