The 2018 annual Margrit Mondavi Summer Concert Series is the 49th Summer Concert series at Robert Mondavi Winery. It once was the biggest concert event in Napa Valley and featured top jazz and popular artists before they decided to appeal to a younger crowd. It’s no long the big dog with the rise of BottleRock, Festival Napa Valley and so many on-going venues, but many people still like to sit on the lawn and listen to the music while they picnic and drink Mondavi wines.