Here's one I missed for the Placemakers chapter. In Red Hook, NY, the library conducted a Libraries Transforming Communities engagement process. The timing of the one stoplight in town was a known issue and irritant but the enagement process identified it a top priority for the community. That it had been in need of fixing for years had further contributed to poor attitudes about the civic process there.
The library was able to lend its expertise to help the community and local officials coordinate calls and letter writing to state agencies to get the stoplight fixed. That's the library using its particular skills and status to strengthen community-based placemaking, to improve access to shaping the physical facts of the town.