The doors opened at 10:45 a.m., and players believing that the odds are better at a newly opened casino scurried to their new favorite slot machines and table games. is scheduled to open its property on the Mystic River, known as Encore Boston Harbor, next year. Residents of western Massachusetts roared into MGM Springfield on Friday, embracing the new hometown casino that celebrates the city’s industrial roots.Ī parade of MGM employees trailing a Springfield Police Department motorcycle escort led customers into the $960 million property: MGM’s 28th casino resort and the state’s first casino-hotel. Guests play table games and machines on opening day for the new MGM Springfield $960 million property in Massachusetts Friday, Aug.