Thai parliament has not ruled on the meeting in part due to extreme political instability in Thailand.
Surin was once part of a wider Khmer empire that encompassed parts of modern-day Thailand and Vietnam.
The Khmer Rouge tribunal sentenced Duch to a commuted 19 years in prison, earlier this year.
More than 8,000 victims have filed with the unit and are awaiting the trial of four jailed senior Khmer Rouge leaders.
Cambodia is preparing for local commune elections in 2012 and national parliamentary elections in 2013.
The bridge stampede left 353 people dead and nearly 400 injured.
Cambodia currently spends around $50 million per year for its HIV and AIDS programs, with about 90 percent funded by donors.
After the asylum seekers, were put on a plane and sent to China, Chinese leaders pledged $1.2 billion in aid to Cambodia.
The three men were arrested in Oddar Meanchey province and accused of illegal entry and possession of weapons.