June 21 (Reuters) - Greek Prime Minister George Papandreou faces a confidence vote in parliament on Tuesday, a major hurdle for him to overcome in securing fresh international aid and averting the euro zone's first sovereign debt default. [ID:nL3E7HL0BG]
Here are key challenges and deadlines that Greece will need to meet in coming weeks:
TUESDAY, JUNE 21
Parliament holds a vote of confidence on Papandreou's newly reshuffled cabinet at around 2100 GMT.
TUESDAY, JUNE 28
Deadline set by government to push through parliament a 28 billion euro ($39.8 billion), five-year austerity package of tax hikes and spending cuts agreed with the European Union and the International Monetary Fund.
SUNDAY, JULY 3
Deadline set by the EU for the Greek parliament to pass laws implementing the austerity package -- potentially more difficult as the laws will cover individual privatisations, tax steps and spending cuts.
Euro zone finance ministers hold an extraordinary meeting on this date and have said Greece must pass the laws by then to obtain its next, 12 billion euro tranche of bailout loans. Greece has said it will be unable to pay its debts by mid-July if it does not get the tranche.
Euro zone finance ministers have said they will define by early July "the main parameters" of a new international bailout plan for Greece, which will supplement the 110 billion euro bailout launched in May last year. The new package will include additional official loans and a voluntary rollover of Greek debt by private investors.
FRIDAY, JULY 15
Six-month Greek Treasury bills worth 2.4 billion euros mature.
FRIDAY JULY 22
Three-month Greek Treasury bills worth 2 billion euros mature.
SATURDAY, AUGUST 20
A 5.9 billion euro, five-year Greek government bond matures.
Papandreou has announced a referendum will be held this autumn on Greek electoral and political changes, including the responsibilities of ministers. This could develop into a de facto test of support for the government and austerity. (Writing by David Cutler of London Editorial Reference Unit and Renee Maltezou in Athens; Editing by Andrew Torchia)