Which event could you find at the Sonoma County Fair in addition to horse racing?

The correct answer is the flower show, as county fairs often showcase a variety of agricultural and horticultural exhibits. Flower shows highlight local gardening talents, featuring displays of floral arrangements, individual plant specimens, and landscaping ideas. These events celebrate the beauty and variety of plants and flowers, making it a common feature at fairs where agriculture is a significant theme.

While food truck rallies, music concerts, and art galleries can also be found at fairs, they aren't as traditional or specifically associated with the agricultural focus typical of events like the flower show. Thus, the flower show stands out as a culturally relevant activity in the context of a county fair setting, enriching the overall experience with its emphasis on plant life and horticulture.