Participatory forums, in which lay citizens or users of public services contribute to the governance of public services, have proliferated in recent years. In debates about the quality and influence of such processes, there has been increasing recognition of the importance of emotional as well as rational deliberation, and criticism of the way in which the structures imposed on such forums can exclude certain participants and discourses. This paper presents a study of one such forum, convened by an independent organization to influence the development and management of state services, and governed by self-determined norms of participation and conduct. It highlights both the potential of such public deliberations beyond the state to generate novel outputs that influence public-service provision, but also the way in which such forums, and their lack of imposed rules and norms of deliberation, can themselves work to exclude certain participants and discourses.