Two demonstrations—one of factory workers and one of displaced city residents—were held on Monday.
Security forces have left a village in Kratie that was the site of the shooting death of a teenage girl by government forces last week.
Ten political parties kicked off campaigning across the country on Friday, in anticipation of commune elections June 3.
The delegation also met with UN officials in New York last week and were scheduled to talk with the US State Department Friday.
Tribunal spokeswoman Yuko Maeda said the judge had not expected the tribunal proceedings to last as long as they have.
Those arrested were Khat Sovann, 54, Pum Vannak, 53, Pon Soeurn, 34, and an unnamed fourth suspect.
The Cambodian People’s Party dominates the airwaves, and other parties have long complained that its hold in the media.
Rights workers estimated between 400 and 1,000 villagers in Broma village, Chlong district, were set to be evicted.
At least 10 parties have registered for elections, which will be held across 1,633 communes next month.
He lauded the ruling Cambodian People’s Party and its role in protecting Cambodia’s traditional monarchy.
Family members say Chan Samnang died because of exposure to poor living conditions at a relocation site outside the city.
An attorney for the three women, called the summons “a good opportunity” that would allow the women to “tell the true story."