It will be the 41st celebration of the day that the military junta handed over power to the politicians.
In 1974 Konstantinos Karamanlis, a conservative politician who had served as prime minister from 1955 to 1963, was summoned back from self-imposed exile in France to restore democracy and rebuild a country ravaged by seven years of brutal and inefficient military rule.
In his Democracy Day speech President of the Hellenic Republic Prokopis Pavlopoulos on Thursday urged Greeks to reaffirm their commitment to Europe and stressed that they must not to allow either the causes or the consequences of this seven-year dictatorship to be forgotten.
President Pavlopoulos will also host a luncheon for the political party leaders at 14:00 local time at the presidential mansion.
The luncheon will be attended by Prime Minister Alexis Tsipras, main opposition New Democracy's interim leader Evangelos Meimarakis, the head of the opposition party Potami Stavros Theodorakis, Communist Party of Greece (KKE) Central Committee member Athanasios Pafilis (in the absence of KKE General Secretary Dimitris Koutsoumbas), the head of the Independent Greeks (ANEL) party Panos Kammenos and PASOK leader Fofi Gennimata.