An in-session workshop was held on 9 May 2017 in Bonn, Germany, on opportunities to further enhance the effective engagement of non-Party stakeholders with a view to strengthening the implementation of the provisions of decision 1/CP.21. The workshop was open to all Parties and observers attending the forty-sixth sessions of the subsidiary bodies as well as those participating by virtual means through Twitter. It featured a panel discussion on how to enhance partnerships between Parties and non-Party stakeholders for effective engagement, as well as three parallel breakout groups focused on the key issues raised in submissions from Parties and non-Party stakeholders, including: enhancing the ambition of nationally determined contributions and national adaptation plans; expanding the scope of non-Party stakeholder contributions at the intergovernmental level; and diversifying modes of engagement and facilitating participation at the intergovernmental level. Parties and observers engaged in a frank, open and inclusive discussion of all issues, with the Chair of the Subsidiary Body for Implementation (SBI) noting that “all participants are panellists”. This report on the workshop was prepared for consideration by SBI 46.