How does the Social Lab methodology support participatory research? This paper provides an evidence-based analysis of experiences of 19 implemented Social Labs applying experiential learning cycles on the question of how to induce Responsible Research and Innovation in the Horizon2020 research funding scheme of the European Commission and beyond. It looks at the potentials of Social Labs to allow participation in research and innovation addressing societal challenges and contrasts empirical results with the theoretical conceptualisation of a scientific Social Lab methodology. (...) It discusses drivers and barriers of engagement, and provides evidence for the impacts of experimental engagement on participation in the context of the labs, substantiated by concrete examples from some of these labs. (shrink)