If you haven’t considered it yourself, see if you can work with the library on a publicity campaign. The library here offers “We [heart] our library” signs for people’s lawns. They get people into a city-wide book read every year and give out free copies of the book to whoever wants them. This year, it’s The Martian. See what services your library might offer like 3D printing or even just free xeroxing and faxing and see what you can do with informing local social media groups.

My wife is a public library administrator here in Indiana and I would be happy to talk to her about more ideas if you want them.