The 13 women were found guilty of illegally taking land and resisting public officers.
Guide by Geneva-based NGO Interpeace summarizes decades of best practices.
Around 50 demonstrators gathered in front of Phnom Penh municipal court Wednesday morning, where they stayed all day.
City officials could not be reached for comment, but rights workers said they expect the 13 detainees will appear in court Wednesday.
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.
The delegation also met with UN officials in New York last week and were scheduled to talk with the US State Department Friday.
Those arrested were Khat Sovann, 54, Pum Vannak, 53, Pon Soeurn, 34, and an unnamed fourth suspect.
Rights workers estimated between 400 and 1,000 villagers in Broma village, Chlong district, were set to be evicted.
Family members say Chan Samnang died because of exposure to poor living conditions at a relocation site outside the city.
Villagers say they have been pushed off nearly 1,500 hectares of land to make way for the senator’s sugar cane crops.
The country had nearly 450,000 Internet users at the end of 2011, according to the Internet World Stats website.