After years of planning and a longer-than-anticipated period of construction, the grand opening of the $1.4 billion MGM National Harbor casino and resort on the eastern shore of the Potomac River in Prince George's County, Maryland finally arrives next Thursday, December 8. Maryland Readies for MGM National Harbor Grand Opening A new installment of Inside Gaming tells of the much-anticipated opening of a new Maryland casino scheduled next week, reports on very positive revenue for Nevada casinos in October, shares news of a lawsuit filed by an Atlantic City casino owner who wants to 'make New Jersey great again' (sound familiar?), and notes Caesars' new plan to start charging for parking at its Las Vegas properties.