This video from Britain is called Historical anti-war protest in London: 15 February 2003.
Stop the Iraq war demonstrations will be everywhere in the world, on Saturday 17 and Sunday 18 March.
For instance, just in one of the smaller states in the USA, Maine in the North East, according to Associated Press:
Demonstrations to be held in more than 100 towns across Maine
March 16, 2007
PORTLAND, Maine –Demonstrations are being planned in more than 100 Maine towns and cities on Sunday in observance of the fourth anniversary of the U.S. invasion of Iraq.
The gatherings are organized by a grass-roots group known as From Every Village Green, which expects thousands of Mainers to participate depending on the weather.
The events were originally planned for Saturday, but were pushed back a day because of the winter storm.
On Saturday 17 March, there will be a big March on the Pentagon in Washington, DC, capital of the USA.
Also on 17 March, there will be a peace demonstration on Dam square in Amsterdam, The Netherlands.
On Sunday 18 March, there will be a peace march in Brussels, capital of Belgium.
The new SDS in the USA: here.