The IAU100 Under One Sky Event took place at the Palace of the Academies in Brussels (Belgium) on 11-12 April 2019. The event featured dedicated sessions with high-level representatives and prominent astronomers, with a focus on astronomy for diplomacy and peace, development, education, outreach, arts, and its involvement with the high-tech industry. Find more information about the event here, check the pictures from the ceremony here and see the complete ceremony on the videos below.