The anti-war demo was convened in Kuala Lumpur.
A tribunal to try UK Prime Minister Tony Blair and US President George Bush for war crimes will be convened on Wednesday.
It is no surprise that neither man will be attending the proceedings - they may not even be aware that it is taking place.
But start it will, at a conference in Kuala Lumpur called as part of the former Malaysian Prime Minister Mahathir Mohamad's campaign to criminalise war.
Dr Mahathir is not expected to sit on the tribunal. He couldn't quite be characterised as impartial.
Dr Mahathir said: "What is Blair if not the co-murderer of 500,000 Iraqi children and the liar who told the British that Saddam had WMD (Weapons of Mass Destruction) which could be launched against Britain within 45 minutes?
"History should remember Blair and Bush as the 'killers of children'."
Although the aim of the conference - entitled Expose War Crimes, Criminalise War - is to outlaw war itself, for many Malaysians who've turned up that means one thing.
"They're giving an open mind to people who know what kind of war crime that the US do to our communities in the world," was one man's assessment. It seemed to be that of most people.
"It is the converted preaching to the converted," said Gwynne Dyer, a journalist and Oscar-nominated documentary maker who addressed the conference.
"But I think this [conference] has potential," he said. "It actually has a goal beyond cheering people up and allowing them to vent."
And there's a lot of venting going on here.
Specifically it seems to be to vilify Tony Blair and George Bush.
'Vast conspiracy'
The meeting has attracted a curious range of speakers.
The former UN humanitarian co-ordinator in Iraq Hans Von Sponeck shares a platform with author Alfred Lambremont Webre.
Mr Webre claims to have uncovered a vast conspiracy to profit from wars. He's also keenly interested in intelligent extra-terrestrial life.
The message is made quite clear by an exhibition staged in parallel with the conference.
Its style is Madame Tussauds on a shoestring, and it features tableaux illustrating the carnage of the world wars, the Palestinian problem, Vietnam and of course Iraq.
There's a section comprising a cage and a couple of dummies wired up to electrodes with the song Rivers of Babylon pumping away in the background.
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