However, the worst sandstorm for years has hindered the arrival of some important delegates, including Kurdish leader Mas'ud Barzani.
Meanwhile violence continues. A suicide bomber killed at least three people and wounded at least 11 others when his car blew up near a U.S. military convoy in Baghdad's central Tahrir Square.
The Interior Ministry says 10 police officers were killed in a series of incidents in Baghdad.
For the latest news and analysis on Iraq, see RFE/RL's webpage on "The New Iraq".