The administrative announcement comes a day after all four were indicted by prosecutors, who sent in their final submissions on Monday.
Duch was given a commuted sentence of 19 years for his role in the torture and execution of more than 12,000 people.
An estimated 2 million people, or a quarter of the population, perished under the regime.
With the verdict of Duch passed and the court now looking at its second case, some victims have not been satisfied.
The meeting in Lowell, Mass., will be an opportunity for the Cambodian community to get an update on complaints they filed to the court.
Former Khmer Rouge cadres contacted by VOA Khmer claimed the recent Duch's verdict had not caused concern in former Khmer Rouge areas.
The book was handed out at Tuol Sleng, which is now a museum, the mass grave site of Choeung Ek, and in Phnom Penh's Prey Sar commune.
“Breaking The Silence” is a play designed to encourage people to talk among each other about their experiences under the Khmer Rouge.
The museum holds an archive of 4,186 prisoner confessions, 6,226 prisoner biographies and 6,147 photographs.
Many victims were disappointed with the UN-backed Khmer Rouge tribunal's sentencing of prison chief Duch last week.
International donors have praised the conclusion of the Khmer Rouge tribunal in the case against prison chief Duch.
The author of a Khmer Rouge memoir who now lives in the US is raising funds to help education in Cambodia.