CHICAGO, June 30 /PRNewswire/ -- This summer, more than 74 million Americans will light up their grills for tasty outdoor gatherings and that means getting those grills and backyards ready for holidays such as Independence Day. Mr. Fix-It, Lou Manfredini, national home improvement expert and host of the nationally syndicated television and radio show HouseSmarts, offers these simple steps for how preparing can make your summer entertaining even easier. Thrill of the Grill Before you get your g