Medical congresses play a pivotal role in the continuing medical education of healthcare professionals (HCPs), particularly in light of the rapid advancements in medical knowledge and technology. Notwithstanding, little is known about the internal dynamics of such events and how they contribute to the learning processes in communities of health professional practice. This study aims to uncover and elucidate what motivates HCPs to participate in medical congresses and how they experience their participation through a qualitative study. Attending six in-person medical congresses in Western Europe in 2023, we collected data through a combination of ethnographic methods including 69 in-situ interviews, 17 in-depth interviews, and extensive participant observations. We analyzed the role of the physical environment, participant motivation, interdisciplinarity, and participant diversity for medical congress attendance, ultimately identifying four types of congress participants: Explorers, Newcomers, Drivers, and Updaters, each characterized by unique patterns of professional experience and engagement within the professional communities. Our findings elucidate the complex motivational landscape of medical congress participants, where the desire for learning is routinely complemented by the pursuit of peer recognition. Our insights and the qualitative typology of medical congress participants introduced have the potential to optimize continuous medical education and shape the structure of future medical congresses by shedding light on the evolving needs of HCPs in diverse medical fields.