This document analyzes the impact of the Napa Valley Tweetup event hosted by Robert Mondavi Winery on the winery's brand and social media presence. It finds that the event improved Robert Mondavi Winery's share of voice on social media compared to before the event. It also maintained a higher share of voice over time compared to other Napa Valley events. The event generated positive feedback and discussions about the winery and helped increase awareness of the Robert Mondavi Winery brand.