MGM is opening other casinos throughout the country, including several in Las Vegas. As of June 19, limited indoor dining will be allowed, gyms may reopen with reduced capacity and casinos, arcades and malls may reopen with health and safety measures in place. The “Maryland Strong: Roadmap to Recovery” plan is now in its second phase. ( Read about MGM National Harbor's plan here.) MGM has a safety and health plan ready for the National Harbor venue that includes physical distancing, safety barriers and more. Neither Prince George's County nor MGM National Harbor have announced an opening date for the casino yet. However, Prince George's County leaders are allowed to delay local openings if they feel it is necessary for health and safety. MGM National Harbor has a safety and reopening plan in place - and it will be allowed to reopen as early as June 19, Maryland Gov. UPDATE JUNE 23: MGM National Harbor has announced an official reopening date, safety protocols and more.