Write a warm, engaging news report about the potential Sphere-style venue near Washington, D.C. that could be built at National Harbor, Maryland, detailing the 6,000-seat plan, 16K interior LED, 4D tech, immersive sound, and the projected economic impact, including job creation and annual revenue. Include quotes from officials and highlight how this fits into Sphere Entertainment’s global network aspirations, while noting the various factors (financing, incentives, approvals) that could affect whether the project moves forward. Ground the piece in the context of the Las Vegas Sphere and recent international developments.