Dozens of buses loaded with protesters headed to Athens in the early hours of Sunday morning.
The demonstrators are furious at a name deal with the neighbouring Republic of Macedonia.
Under the so-called Prespes agreement, Greece’s neighbour will change its name to Republic of North Macedonia in exchange for the Greeks ending opposition to its bid to join the North Atlantic Treaty Organization and the European Union.
Thousands of Greeks are set to march through the streets of Athens on Sunday, as Prime Minister Alexis Tsipras steels himself for another showdown in parliament over the agreement.
