The University of Colorado Boulder will host a conference that explores the phenomenon of slavery from a global, historical perspective on Sept. 27-28. The event will include scholars specializing in the study of slavery in ancient, medieval and modern contexts and in global regions that include Western, pre-Columbian, African, Asian and Muslim. Titled âWhat is a Slave Society: an International Conference on the Nature of Slavery as a Global Historical Phenomenon,â the event will be held in the British and Irish Studies room of Norlin Library.