25 cities and metropolitan areas participated in the EMA 2017 held in Warsaw, where they discussed issues such as metropolitan solidarity, the role of metropolitan areas in the post-2020 EU Cohesion Policy, and shared best practices of collaboration among metropolitan areas. The conference culminated with the signing of the Warsaw Declaration by all participants, supporting the continuity of Cohesion Policy beyond 2020 and calling for a greater role of metropolitan areas in it.
The Forum EMA "Towards an agenda metropolitan Common" was held in Turin on 12 February 2016, with the participation of the major international networks and organisations, such as the Dutch presidency of the EU, and political representatives from 32 cities in 16 countries (22 new cities compared to the previous year), including the European metropolitan areas of Paris, Lyon, Madrid, Bilbao, Vienna, Budapest, Warsaw, Stuttgart, Athens, Helsinki, Poznan, Milan, Florence, Bologna o Lisbon.
Barcelona hosted the first EMA meeting "Conference on Metropolitan Governance and Territorial Competitiveness" on 13 March 2015, with political representatives from 15 cities in 10 different countries (Vienna, Paris, Brussels, Turin, Bologna, Toulouse, Porto Rennes, Lille, Marseille, Liverpool, Warsaw, Oslo, Novi Sad and Barcelona), as well as the OECD and other global and European networks of cities (UCLG, Metropolis, Eurocities, METREX, and Medcities FMDV).
In the first EMA forum, European policy makers were able to share and know about other local authorities' actions to ensure sustainable, competitive and socially inclusive urban development.
The AMB opened up, thus, a space of political debate to build together the future European Metropolises, led by proactive, dynamic, innovative and opened to participation metropolitan authorities, to improve the welfare of citizens.