In the early and mid-twentieth century, scientific conferences were a popular tool to establish communication between scientists. Organisational efforts, research and funds were spent defining what makes a productive and successful scientific gathering. A unique example of this was the monitoring and evaluation system of the Gordon Research Conferences (GRCs), which conceptualized informal communication in small, specialized meetings as the best method of advancing cutting-edge research. Studying the detailed monitoring reports of the sessions and the evaluation forms filled by the (...) participants, this paper explores how a concrete format of scientific knowledge production and identity formation was created and reproduced. The normative assessment of the participants’ interactions is examined in the contexts of (a) their professional affiliations, (b) the conference presentations and discussions and (c) activities related to play. The study of the GRCs exemplifies how scientists actively conceptualised characteristics like academic affiliation, manners, leisure practices and social categories such as gender as ways to understand, describe and measure how knowledge is best produced and transmitted, turning the conferences into a fertile ground for meta-scientific reflections. (shrink)