In Cambodia, May 20 is known as the Day of Anger.
The delegation of four will assist in a pledge meeting on May 25 to solicit promises of funding from donor countries.
This memorial was one of more than a hundred that have been going up around villages in Cambodia.
The CPP held a ceremony “for national reconciliation” and “to remember our pain” under the regime.
“Breaking the Silence” urges victims and perpetrators to address their collective trauma.
The tribunal allows “civil parties,” or victims of the regime, a measure of participation in trials.
An estimated 500,000 Cambodian Muslims died under the Khmer Rouge, through overwork, starvation or execution.
The Documentation Center of Cambodia says it has performed around $300,000 in unrecognized work for the UN-backed Khmer Rouge tribunal.
Helen Jarvis, head of the unit since April 2009, is said to leave on the 30th of June.
Exhibitions and talks can help people understand the plight Cambodians faced when the Khmer Rouge came to power.
Theater drama aimed at getting people to talk about their trauma under the Khmer Rouge.