(1) The Open Culture Data initiative in the Netherlands aims to stimulate collaboration and creativity by opening up cultural data from memory institutions through a bottom-up approach.
(2) An initial phase involved establishing guidelines, releasing 8 datasets, and holding a hackathon. Subsequent phases focused on building community through masterclasses, two hackathons, and an app competition that resulted in 27 submitted apps using 35 datasets.
(3) Lessons learned include the importance of expertise, senior management buy-in, face-to-face meetings, starting small, and focusing on sustainability. Future work includes improving search and APIs, executive education, and opening data in other countries.