Survivors were invited to draw what they could remember of the Khmer Rouge, from torture to lost family members.
The proposed March comes as workers face increasing pressure from food and fuel prices, while salaries remain low.
For two days, from April 29, researchers, experts and enthusiasts will gather in Athens, Ohio, to share their thoughts and findings.
“In order for a country to be both economically and politically strong and powerful, youths' human resources are needed", said a caller.
Ouk Seng said Thursday she had made up the allegations because she wanted to return home to her children.
At least 11 demonstrators were arrested and four were injured in police beatings.
The groups met in Phnom Penh to discuss development plans, foreign aid pledges and Cambodia’s development needs for 2012.
Since 2009, Cambodia has been trying to meet international standards for adoption.
Cambodians nationwide rung in the Buddhist year 2555 on Thursday afternoon, ushering in the Year of the Rabbit at 1:12 pm.
Human Rights Watch, Amnesty International and other major international groups have called on the government to drop the law entirely.
Critics say the law will erode development progress Cambodia has made over the past 20 years.
On Wednesday, 62 international NGOs working in Cambodia stated their strong opposition to the law.
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