Sprint Planning: the PO will have a prioritized product backlog that is ready to be discussed and is clarify each item with the development team, to enable the team to collectively estimate the effort involved.
Sprint Review (demo): PO presents the completed product increment to Stakeholders and gathers feedback. Prioritizes the new feedback against the product backlog to determine work for the next iteration
Daily Stand-up: PO can attend to provide support to the team by removing blockers/impediments on requirements.
Sprint Retrospectives: PO can attend to contribute factual information about process improvements in the team’s process and support continuous improvement.