No more Grand Slams for FReeper Registered After 22 years, restaurant closes its doorsDenny's Restaurant, a virtual institution among late-night diners, abruptly closed its doors for good Monday afternoon, citing lagging business.The Norton shores restaurant, which opened in 1980, closed at 3 pm Monday. The restaurant was hurt financially by safety and security concerns that forced the corporation to stop making it a 24-hour eatery-a "trademark" of Denny's restaurants, a corporate spokeswoman said.Customers (Like Me) and workers were not given advance warning the restaurant would be closing, said Melanie Mathews of Muskegon, a (darn good) server at the restaurant. Employees,...