Author events are a core staple of public library programming, and represent a critical component of an authors’ platform to engage fans and new readers alike. Since many libraries often work directly with authors, publishers aren't always aware of their events' full impact on discovery and sales. In this session, Guy LeCharles Gonzalez, Project Lead for the Panorama Project, shows how public libraries can effectively track, measure, and contextualize the full monetary value of their marketing efforts for publishers and authors. The presentation includes key insights from the 2019 Library Events & Book Sales Survey, and a preview of the Library Marketing Valuation Toolkit.