We invite all PPIE projects and interested people in participatory research and public involvement initiatives to join our 4th PPIE peer network meeting. The meeting aims at exchanging experience on public and patient involvement and engagement (PPIE) activities and methods. Prof. Liz Richardson, University of Manchester, will share her experience and expertise working with public and patient involvement in research with the discussants. The meeting will be held in English and takes place online via Zoom.