The 3rd Basel Sustainable Publishing Forum is intended to bring together stakeholders from across the scholarly communications landscape to discuss the progress of the transition to open, looking to Plan S and other approaches more generally supporting Open Science. The conference will present the different perspectives of policy makers, libraries and publishers and serve as a forum for sharing common challenges and solutions at a time when the discussion on the future trajectory of scholarly communications has never been more prominent, or vital. As the focus moves from subscriptions to APCs, the forum will present global perspectives, and explore some of the new inequalities faced by research communities.