Hi, April -
Did you ever see my question about whether it was a good or bad idea to work with local libraries on using mesh ideas to signal-boost their wifi throughout neighborhoods? The queasy part for me is this creates a contact point with government/bureaucracy.
The interesting part is local libraries are well distributed throughout a city. Senior centers are as well, and in Berkeley they have wifi. The downside is their wifi would only be on for certain hours, and there might be some content-blocking.