This paper examines partnerships between schools and actors in the sustainable development education community using the example of the Urbanbees project. Urbanbees brings together representatives of various scientific and cultural institutions around the controversial theme of the decline of wild bee populations. We analyse the ecovolunteer day for teachers, a part of the project’s large-scale communication plan aimed at a wide public. This participatory communications event is an opportunity for the organisers to form partnerships with schools. The results of this study show the influence of the treatment of socioscientific issues within this participatory communication upon the nature and form of the partnerships : we highlight the means...