The full list of hotels in the area is:
http://www.prespes.gr/prespa/index.php/2015-05-03-15-45-22
The list is in Greek but the info in the link of most of the hotels is in English. The areas that are close to the Encounters/Conference are Psarades, Agios Ahilios, Agios Germanos, Plati, Laimos.