Make Music Harvard Square, a street music festival organized by the Harvard Square Business Association and the Québec Delegation, will feature 71 bands on 11 different stages throughout the Square on Saturday. The fifth annual event, which will bring eight hours of live music to the Square, was inspired by the Fête de la Musique, a street music festival celebrating the summer solstice. Founded in France nearly three decades ago, the Fête has spawned similar events in more than 300 cities across the globe, including Cambridge.