Every year the GPM organises its Summit to gather mayors from around the world to discuss on global issues through plenary debate sessions and vote on final resolutions to establish the GPM Declaration. The GPM Summit 2018 report has been published including more than 80 mayors and city network leaders from six continents that gathered in Bristol (2018) to convene on the topics of migration, urban security and health, reflecting the pressing issues of the world. The outcome of the debates between mayors led to the Bristol Declaration 2018.