These are the slides for the LIBER 2021 Session All Together Now: Establishing Successful Collaborations. This session will be chaired by Claudia Fabian, Bavarian State Library, Germany Cultural AI Lab: engaging AI and cultural heritage, Marieke van Erp, KNAW Humanities Cluster; Martijn Kleppe, Koninklijke Bibliotheek; Laura Hollink, Centrum Wiskunde & Informatica, the Netherlands, Ryan Brate, the KNAW Humanities Cluster, Andrei Nesterov, Centrum Wiskunde & Informatica, Valentin Vogelmann, the KNAW Humanities Cluster, Johan Oomen, the Netherlands Institute for Sound and Vision, Antal van den Bosch, the KNAW Humanities Cluster, Jacco van Ossenbruggen, Vrije Universiteit Amsterdam, the KNAW Humanities Cluster, Saskia Scheltjens, the Rijksmuseum, the Netherlands, Lotte Wilms, Tilburg University, the Netherlands A Western Balkans academic library collaboration: Making culture heritage accessible for everyone, Adam Sofronijevic, University library ''Svetozar Markovic‘’, Serbia, Ljilja Petrović Zečić, National and university library of Republika Srpska, Banja Luka, Bosnia and Herzegovina, Mirna Trifković, National and university library ''Derviš Sušić'', Tuzla, Bosnia and Herzegovina, Marija Starčević, Culture center and library, Kotor, Montenegro, Frosina Novak, Philosophy faculty library, University of Skopje, Skopje, Northern Macedonia Enabling Library Support for Open Access Books: From Vision to Implementation, Lucy Barnes, Open Book Publishers / COPIM, United Kingdom The first presentation by Laura Hollink, Marieke van Erp, and Martijn Kleppe will present the Dutch Cultural AI Lab. It will discuss its founding process, setup, mission, and team, and how the Lab approaches the concept of polyvocality through two key projects: Culturally Aware AI and SociAl Bias Observatory (SABIO). Finally, it will also reflect on the role of the cultural heritage institutes within the Lab and its projects, as well as discuss the benefits of library engagement with AI and its research community. The second presentation by Adam Sofronijević will discuss the collaboration of several academic libraries across four countries of the Western Balkans – Serbia, Bosnia and Herzegovina, Montenegro, and Northern Macedonia. With the aim of making cultural heritage more accessible to the public, these academic libraries are combining resources and sharing experiences in reaching audiences, digitisation, and skills development. The presentation will discuss this collaboration and the resources shared. The third presentation by Lucy Barnes focuses on the Community-led Open Publication Infrastructures for Monographs (COPIM) project. This major three-year international project brings together libraries, Open Access publishers, researchers, and infrastructure providers to build Open, non-profit, community-governed infrastructures that will expand the publication of OA books. Since the project is approaching its mid-point, this presentation will discuss COPIM in more detail, as well as share what has been built till now and explain the plans for the next phase of work.