Twentieth International Conference on Environmental, Cultural, Economic & Social Sustainability, University of Aveiro, Aveiro, Portugal (24-26 January 2024). Founded in 2005, the On Sustainability Research Network is brought together by a common concern for sustainability from a holistic perspective, where environmental, cultural, economic, and social interests intersect. We seek to build an epistemic community where we can make linkages across disciplinary, geographic, and cultural boundaries.