CELL's Atif Rizvi and Ayla Bonfiglio attented the Celebration of World Cities Day at UNESCO on October 31, 2018. At the event, Atif Rizvi spoke on a panel on Innovation for Sustainable Urban Development, exploring how can we use innovative tools to overcome the marginalization and segregation that takes place in cities? Also, as part of his intervention, Atif argued that discussions on sustainable cities must include possibilities for rebuilding cities destroyed by conflict and violence. We must also realize the role that cities can play in marginalization, segregation, and exclusion. For more information about the event, visit UNESCO's World Cities Day page.