2245 GMT: It's Going On Outside Tehran.
Norooz reports that
20 people were arrested in demonstrations in Isfahan.
Video is also out of tonight's protests in that city.
2220 GMT: Night Update. Not much new to report in last few hours. After the crowd for the Jamaran ceremony was prevented from attending the memorial and/or forcibly dispersed, there were
further clashes with reported arrests and injuries in Niavaran.
Reports also came through of
Ayatollah Dastgheib's speech in the Qoba Mosque in Shiraz, scheduled for 11 a.m. local time tomorrow.
1825 GMT: Tonight's Memorial. BBC Persian reports that the Jamaran ceremony and former President Khatami's speech
was indeed interrupted by "government supporters" and turned violent before it was abandoned.
1725 GMT: We are checking out the latest stories around the disruption and cancellation of the Jamaran service, including the claim that
plainclothes "thugs" invaded the gathering and halted the Khatami speech.
1705 GMT: Latest Rumours. Claims circulating that the memorial service, with former President Khatami's address, in Jamaran has now been cancelled.
1645 GMT:
Peyke Iran is now carrying a report of
the harassment and beating of the Mothers of Martyrs in Laleh Park this evening.
1630 GMT: Tonight's Events. Conflicting rumours are flying about the gathering for the memorial at Hosseinieh Jamaran. One report is that the Hosseinieh (religious institute) is packed, another is that the crowd (and former President Khatami) have been prevented from attending and are moving toward Qods Square.
There are also reports that the Mothers of Martyrs, whose children have been killed and detained, and supporters have been surrounded by security forces during their weekly protest in Laleh Park.
1620 GMT: Today's Protests. It has been a day of frustration for us, as a major failure from our host service kept us off-line until now.
Since our 1200 GMT update, the streets have been quieter with the notable except of this evening's events at Jamaran in north Tehran (see 1630 GMT), where former President Mohammad Khatami was to speak at a memorial for Grand Ayatollah Montazeri. Security is still tight, with agents reportedly searching personal items at some metro stations, checking cell phones and confiscating some of them. It is also reported that plainclothes security and Ansar Hezbollah wearing black clothing were present around Tehran University although no clashes were reported. We are checking out other stories of attacks on women and children and the arrest of passengers on a bus for shouting anti-Government slogans.
1200 GMT: Here is what we have been following:
The pattern this morning was of running clashes between demonstrators (how many? thousands? tens of thousands? Activists went as high as 50,000 in estimates) and security forces who tried to keep them from congregating. The most serious confrontation was at Imam Hossein Square, with reports of tear gas being used.
There were also reports of clashes near the Mosque of Shahmirzadiha, at Pol-e Choubi, in and around Ferdowsi Square, Enghelab Square and at Val-e Asr near Daneshjoo Park. Security forces tried to contain and divert protesters, who were moving in loudly-honking cars as well as on foot, by setting up one-way systems and closing bridges. A later report claimed that security forces had stormed the Iranian Students News Agency building in pursuit of protesters sheltering there.
Reported chants included, "This is the month of blood - Khamenei will be toppled", and "Tehran is Karbala Today!" (a reference to Imam Hossein's death at Karbala, which is commemorated by Ashura tomorrow). It has also been reported that Mohseni Square was renamed Rahnavard Square by protesters.
There are reports, mostly unconfirmed, of protests in Mashhad, Isfahan, Qom, Shiraz, and Najafabad
0645 GMT (1015 local time): Today is Tasua, the fast day before Ashura, when the death of Imam Hossein is commemorated by Shi'a Muslims. So far it is also a day of quiet and uncertainty: despite talk of the opposition turning out in advance of the mass demonstrations and memorials planned for tomorrow, little has come through on any gathering.
The rumblings continue, however. It is now reported that Hosseinieh Ershad
will not hold any Ashura ceremonies. The religious institute is noted for its opposition to the Shah in the years before the 1979 Revolution, including the passionate speeches of Dr Ali Shariati, a hero of the movement. On Friday it was announced that the Khomeini mausoleum would also refrain from any commemoration of Ashura.
An EA reader notes
an article by Navid Minayi on the “men in hejab” movement that is protesting the arrest and attempted humiliation of student activist Majid Tavakoli. Minayi compares the hejab to apartheid and criticises Nobel Prize laureate and women's rights activist Shirin Ebadi, who defended the veil in her open letter to students. Significantly Minayi's opinion appears in
Rouydad News, an indication that the refomist movement is slowly opening up to social debates such as the wearing of the hejab.
Mowj-e-Sabz, the prominent Green movement website which has relaunched with the vow to publish “different ideas”, is also
considering the issue.
Sunday, December 27, 2009 at 6:35 
We'll be LiveBlogging from about 0630 GMT (1000 Iran time) with all the developments of the day. We'll begin with an analysis considering the significance of Saturday's protests (in short, a huge boost for the opposition, but one which raises the stakes for Ashura even higher) and the possibilities for all the key actors --- the Supreme Leader, President Ahmadinejad, figures like Mir Hossein Mousavi, the senior clerics, and of course the Green Movement.