Iranian opposition leaders have vowed to attend ceremonies to honour those killed in the violence following the country’s disputed election result.
Authorities have refused permission for a ceremony traditionally held 40 days after a person’s death.
Among those who died on 20 June was Neda Agha Soltan, a young woman whose death was filmed on a mobile phone.
The mother of Ms Agha Soltan – who became a symbol of Iran’s protests – is expected to take part in the memorial.
One of 10 protesters who died that day, 27-year-old Agha Soltan was shot to death as she watched protests from the sidelines of the demonstrations.
Graveside ceremony
When footage of her death was posted on a video-sharing website, she became a symbol for the country’s opposition movement.
The BBC’s Jon Leyne says that Shia Muslims traditionally mark 40 days after a death in a ceremony called the Arbayeen.
Bowing to pressure about the treatment of opposition detainees, some of whom are reported to have died in prison, Iranian authorities have announced that many are going to be released.
Twenty who are charged with more serious offences – including bombings and attacking security forces – are expected to be put on trial next week.
There has been growing outrage, even amongst government supporters, about the treatment of opposition detainees, some of whom have died in prison.
On Wednesday, US Secretary of State Hillary Clinton said she deplored the way the Iranian government was treating those it had imprisoned after the violence and urged authorities to release political detainees.
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