The Web site says Auchi met with Illinois Gov. Rod Blagojevich, another politician close to Rezko, along with "businessmen and Congressmen also present in the dinner held in his honor."
There is no mention of Obama being present at the dinner.
Rezko, who has pleaded not guilty to the corruption charges he faces, appeared in an orange jumpsuit in the Chicago courtroom.
His lawyer, Joe Duffy, pleaded with U.S. District Judge Amy J. St. Eve to allow Rezko to remain free prior to the trial so he can help prepare his defense.
"I cannot give him his constitutional defense," Duffy told the judge.
Prosector Assistant U.S. Attorney Reid J. Schar said "Rezko can't be trusted," and the judge ordered him returned to the federal Metropolitan Correction Center in Chicago where he will remain until his trial.
This post has been updated.