The International Conference “Urban Centers: Acting Upon or with Cities”, organised by the ROCK team at the ICS-ULisboa, aimed to explore the current roles and functions of a sample of the most important Urban Centers in Europe. For this, the Urban Centers of Lisbon, Bologna, Turin, Barcelona, Paris and Rome were invited to share knowledge about their experience in promoting participatory approaches with citizens in urban policymaking. You can now watch the conference video and read the final memorandum.