The Centre for Interdisciplinary Studies in Education and Development (CeiED) co-organized, with the Mediation Institute and the European Association for Social Mediation, the International Seminar Mediation Coexistence and Citizenship, which took place on May 29, 2023 in the main hall of the Universidade Lusófona – Centro Universitário do Porto. Professor Alcina de Oliveira Martins, was present at the opening session of the International Seminar, having highlighted the importance of social mediation and reinforced the support of CeiED in supporting projects of this nature. This initiative aimed to have contributed to the sharing of reflections, provided (re)meetings and dialogue around social mediation (school, intercultural, etc.).