Local newspapers do this often. They take a national news story and give it a local twist. This usually meant finding someone it affected locally.
Putting your own community’s twist on a major news story usually helps to strengthen the community bond and provide interesting content.
Also, it’s not too difficult to build a community with a geographical twist. Take a large common interest (for example, Lady Gaga fans) and create a community for Lady Gaga fans in Detroit (or your city).
You can do this within an existing community (as is common) or build separate communities for each city. It focuses your efforts, provides a greater common bond between members and makes real-time meet-ups much more possible.