OSGeo events at EGU General Assemblies: Making Open Science a Reality

This submission reports on the continuing efforts by OSGeo activists within the annual General Assembly gatherings of the European Geoscience Union (EGU). Starting as improvided splinter events, the format soon emerged both into dedicated topical sessions for Open Source within the EGU division of Earth and Space Science Informatics (ESSI), but also dedicated annual evening events (Townhalls). Further, the format of topical Open Source sessions was quickly adopted also by the American Geophysical Union (AGU). This talk covers lessons learned from past events, current developments and opportunities within ESSI in EGU and AGU, and also new acitivities.