"Co-Creating a New Local Public Sphere: On the Potential of Action Research for Re-Vitalizing Public Communication in a City's Centre and Its Peripheries", lecture by J. Reimer and W. Loosen at the 7th European Communication Conference (ECC) of the European Communication Research and Education Association (ECREA) on 3 November 2018 in Lugano (together with A. Breiter, K. Heitmann and A. Hepp).