The document summarizes an agenda for a seminar on semantic services in the European Open Science Cloud (EOSC). The agenda includes presentations on existing EUDAT semantic services like B2NOTE and the Semantic Lookup Service. It also includes presentations from various research communities on their needs for semantic services to support data discovery, integration and interoperability in EOSC. The agenda allows for discussion on community requirements for semantic services to be developed and deployed in EOSC.