Every year at the monastery of Agia Lavra in Peloponnese, the reenactment of the Greek Revolution Oath takes place. Many actors take place an the place gets really crowded.
The biggest ceremony of the year in Olympos village of Karpathos. During this Byzantine custom, the Icons from the main church are being carried on people's shoulders around the village to perform memorials at the other churches and the cemetery.
Arachova is a very famous winter destination in Greece, because it combines the ski resort of Parnassus, along with the ancient city of Delphi. Every year, Saint George name day is celebrated and has a particular interest
Kastellorizon is the Easternmost island of Greece, very near the shore of Turkey and the city of Kas. I have spent two weeks during the Greek Orthodox Easter on the island and got to see the customs and meet very interesting local people.
Olympos is a rather secluded place in Karpathos island where traditions are fading in a very small pace. They consider themselves descendants of the Byzantine empire and is one of the few places in the world where a visitor can experience Byzantine traditions.
The famous religious custom of walking on burning coal barefoot. Believers perform a ritual Dionysian dance to get to a state of nirvana before walking on burning coals.