Good Friday (14 April): The celebration date changes every year. The day commemorating Jesus Christ's crucifixion.
Holy Saturday (15 April): The celebration date changes every year. The last day of Holy Week and of Lent. At midnight the Resurrection of Christ is celebrated.
Easter Sunday (16 April): The celebration date changes every year. The most important Christian celebration, celebrating the Resurrection of Christ.
Easter Monday (17 April): The celebration date changes every year. The second day of Easter.
International Workers day (1 May): Dedicated to the Chicago workers riot in May 1886 demanding an 8-hour work day and better working conditions.
Dormition of Virgin Mary (15 August): One of the most important orthodox celebrations, celebrating the passing and burial of Virgin Mary, with glorious ceremonies in many parts of Greece.
St Dimitrios Memorial Day/Thessaloniki's Liberation from the Ottoman Rule Day (26 October): St Dimitrios is Thessaloniki's patron saint and his memorial day also marks the celebrations of the city's liberation from the Ottomans in 1912.
"No" Day (28 October): On this day the Greeks celebrate dictator Ioannis Metaxas's refusal, on 28th October 1940, regarding Italian claims, leading to Greece taking part in WWII.
Christmas (25 December): One of the most glorious celebration of Christianity, celebrating the birth of Jesus Christ.