Since 1937. For years the people in San Joaquin County have been gathering to celebrate the grape harvest at the annual Lodi Grape Festival. What started out as a small food festival in downtown Lodi has now evolved into a four day event filled with great entertainment, food, vendors, grape and commodity murals, competitive exhibits, carnival, wine tasting, and so much more.Be sure to check the website for website for exact schedule of all the great activities.