Why search Columbia files? I thought the event was held some where (University of Chicago?) just prior to Khalida leaving for Columbia University.
Found this “Another event occurred in February 2005 that included Ayers, Dohrn, and Obama, a fairwell dinner for Arab American Action Network (AAAN) founder Rashid Khalidi” Would have to be the same dinner. From here: http://therealbarackobama.wordpress.com/2008/10/04/obama-and-pro-palestinian-supporter-rashid-khalidi/