The first meeting in the Danish National Research Data Management Network, entitled “Data repositories: Lessons learned, challenges and opportunities.” This meeting aims to welcome everyone to the National Research Data Management Network and kick off the network with a workshop about challenges, opportunities, and lessons learned when working with international, local, and subject-specific repositories. The workshop will provide insight into developments in the open science eco-system at a European level with an introduction to EOSC and the infrastructure, use, and development of local and subject-specific repositories.