NEW : Protesters filed past parliament , their banners and Greek flags flapping in the air over their heads . Police estimate 500 people turned out for a peaceful protest in Athens . A 31.5 billion - euro bailout installment is due from the European Union and Japan . The Greek parliament is required to pass new emergency legislation beforehand . Local media say the vote will be a surprise , with narrow passage expected .
NEW : Police estimate 500 people turned out for a peaceful protest in Athens . A 31.5 billion - euro bailout installment is due from the European Union and Japan . The Greek parliament is required to pass new emergency legislation beforehand . Local media say the vote will be a surprise , with narrow passage expected .