The document announces a technical workshop hosted by the Mediterranean Posidonia Network from September 21-24, 2021 in Formentera, Balearic Islands, Spain. The workshop will include presentations and working sessions on topics like the MPN roadmap, posidonia site visits and surveillance from Formentera, technical exchanges, participation in the Save Posidonia Forum 2021, and discussions on knowledge gaps and future governance. Participants can register on the provided website and will experience posidonia activities in the field along with evening social events with the Posidonia Social Club.