MEEhubs2024: A hub-based conference on microbial ecology and evolution fostering sustainability.

Scientific conferences are essential to academic exchange. However, related air travel contributes to greenhouse gas emissions, while expensive registration and travel costs limit the participation of early career researchers and those from low-income countries. Virtual conferences offer promising solutions for reducing emissions and enhancing accessibility and inclusivity but often limit networking and personal interaction. Hybrid multi-hub conferences, which combine virtually connected in-person venues with individual virtual participation, combine the benefits of both conference formats. Thus, we present and discuss MEEhubs2024, a multi-hub conference on microbial ecology and evolution held in January 2024. During this 3-day conference, attendees participated virtually or at one of six hubs in Europe and North America. We analyzed the participants' and organizers' feedback to create a template and provide insights into the scientific community's adoption of this new conference format, which was positively evaluated by most participants. Because technical, logistical, and structural challenges remain, including limited opportunities to interact and network across hubs and participation modes, we provide recommendations for improvement, such as hiring technical hosts and offering virtual-only social activities. Finally, we used the participants' feedback to reflect on conference expectations, highlighting research gaps and the need for organizers to define and communicate goals when organizing conferences.