The objectives are to consolidate the collective around the eventual creation of two projects: (i) the establishment of a third place that brings together a diversity of actors acting at the interface between research and action for the dynamic management of cultivated diversity and (ii) the definition of collaborative research programmes on the dynamic management of cultivated diversity. In addition, ARCAD should be positioned in a dynamic of openness integrating social diversity by strengthening and anchoring the link between research and civil society. To help achieve these objectives, an international seminar bringing together the group already formed, extended to new actors interested and/or involved in third places initiatives, is envisaged as a milestone event to continue the collective reflection on the construction of third places.