Supporters on both sides of the Greek referendum are planning rallies ahead of Sunday's vote, with the two sides almost neck-and-neck, according to polls.
Prime Minister Alexis Tsipras – who has spoken strongly in favour of the No vote – is expected to appear at a rally that will oppose the terms being offered by Greece's lenders.
A poll published in Ethnos newspaper on Friday suggested a slender lead for the Yes vote, at 44.8 per cent, with the No vote at 43.4 per cent.
But human rights body the Council of Europe has warned the referendum will "fall short of international standards" if held as planned, citing the short notice given to voters and the lack of clarity in the question to be put to voters.
Already there have been several protests against the demands being made by Greece's three lenders – the IMF, the European Central Bank and the European Union – with the EU flag being burned in some demonstrations.
Emotions are running high, not least because people can't get their own money out of the banks. There is now thought to be just €500m cash reserves across Greece's major banks, and the daily withdrawal limit has been dropped from €60 to €50 - apparently because the €20 notes are running out.
Read more: IMF: Another Greek bailout will cost €52bn
Finance minister Yanis Varoufakis has threatened to resign if the country votes in favour of the terms. But Eurogroup president and Dutch finance minister Jeroen Dijsselbloem has warned that Greece's creditors will not negotiate with its leaders if voters reject the terms.
Yesterday the IMF warned that Greece would need more than €50bn additional financing by the end of 2018, as well as doubling the time it has to pay its current loans back, to stay afloat.