Yesterday, on 21 May, the University of Bonn celebrated its ‘Sustainability Day’ at a public event. The day promoted various projects within and around the university that aim to make research and research infrastructure more sustainable. RE4GREEN was represented by Jan Mehlich and Fabian Fischbach. Visitors could participate in two key RE4GREEN social lab exercises, which often led to engaging discussions and sparked the interest of young scientists, as well as raising awareness within the local research community. Many thanks to the organisers at Team N at The University of Bonn for organising this important event.