In 2020, the Swiss Federal Commission for Migration launched a new programme called ‘New us’. The national programme called for participatory projects that question the ‘us and them’ binary and present alternative models for strengthening cultural participation, social cohesion and a polyphonic ‘us’ in Switzerland. This contribution critically appraises a citizen-art project that met the funding criteria of ‘New us’. We argue that the scientific approach of developmental evaluation serves as a compass for the development and steering of open-ended participatory processes. The combined reflection on the artistic and scientific evaluation process engages social work research in the facilitation of cultural participation.