More than 30,000 families have been pushed out of their homes in flooding that began in August.
The capital and many other places across the country have been inundated in recent weeks.
Peou Nam was taken twice for execution in a pit by the Khmer Rouge, and survived both times.
The Khmer Parents Association in Long Beach, Calif., organized its 7th annual health fair for Cambodian-Americans over the weekend.
Despite concerns, Lao officials are still pressing for construction.
United Nations officials say the capitals of Thailand and Cambodia are at risk as the worst flooding in modern times.
At least 760 families in two of the capital’s districts are facing displacement.
Lao Monghay, an independent analyst, said that election officials must work harder to act as “hosts” for registrants.
Authorities say at least 176 people have now died in flooding that began in August and has continued across the country.
Observers say some of the lists have the same name twice, while some retain “ghost” names of inexistent people.
The teachers, from 18 provinces, gathered at Freedom Park in the capital, the only sanctioned space for such demonstrations.
Oxfam America said in a statement that government and relief agency responses are under way, but more assistance is necessary.
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