Key TakeawaysMGM Resorts International raised concerns about advance bookings for a Formula 1 car race in Las Vegas scheduled for November, and the company's shares slid Thursday.Chief Executive Officer (CEO) Bill Hornbuckle said Wednesday that MGM Resorts' room rates around the event are showing some softness, which could affect fourth-quarter results.The hotel and casino operator's second-quarter profit and sales released Wednesday beat estimates. Shares of hotel and casino operator MGM Resorts Internatio ...