To keep stakeholders engaged during a facility upgrade, implement a Stakeholder Engagement Plan (SEP) that focuses on participation and clear communication. First, identify stakeholders—employees, management, clients, suppliers, and community members—to understand their interests. Establish communication channels like a dedicated project website, regular email updates, and active social media. Schedule regular meetings for updates and feedback, using visual tools like timelines and before-and-after photos to showcase progress. Encourage input through surveys and involve stakeholders in decision-making when possible. Finally, monitor engagement levels and respond promptly to questions to build trust and transparency throughout the project.