In Londonderry, hundreds of nationalists held a peaceful demonstration at Free Derry corner celebrating Mrs Thatcher's death.
He said he feared the government would incite violence at what he hoped would be a peaceful demonstration.
Mr Madhav expects 1m people to turn up and to move on to Ayodhya for a peaceful demonstration.
Saturday's action was delayed by pro-hunting protesters who staged a peaceful demonstration in the village Llanfinangel Nant Bran.
Police said they would work with other agencies to "facilitate a peaceful demonstration and ensure minimum disruption is caused".
Far-Right Jewish Israeli political activists held a peaceful demonstration in the radical Arab-Islamist dominated city of Umm el-Fahm in the Galilee under heavy police protection.
Meanwhile, a message on opposition leader Mir Hossein Moussavi's Facebook page, which could not be authenticated, called for a peaceful demonstration in Tehran on Thursday to honor the dead.
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The document also voiced concern over reports of mounting violence against opposition activists in Zimbabwe, and called on the government of Robert Mugabe to respect the right to peaceful demonstration.
Mr Saleh's (Yemen's current president) security forces arrested four female doctors on 19 April 2011, while the doctors were marching along with a peaceful demonstration to provide medical help if needed.
In what was a largely peaceful but loud demonstration Wednesday in Athens, some of the protesters banged drums, while others chanted slogans and held banners opposing the austerity policies prescribed by the European Union and the International Monetary Fund for the country to remain inside the euro zone.
True security will come through adherence to international law and the demonstration of its peaceful intent.
Friday's demonstration remained relatively peaceful, at least inside the cordoned-off perimeter of Tahrir Square.
Avon and Somerset Police said the demonstration had been "largely peaceful".
An online protest group stated that it was planning a "peaceful protest" encouraging people to attend a demonstration on Saturday afternoon.
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The BBC's Sean Klein at the demonstration says the mood is angry but peaceful as they head on towards parliament.
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Although the demonstrators were peaceful, police used force to break up the demonstration, and at least one or two people have been shot dead.
At the March 2011 demonstration, there were clashes between police and protesters in Trafalgar Square - hours after a peaceful march to Hyde Park.
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