The Minneapolis Aquatennial is an annual event held in the U.S. city of Minneapolis, Minnesota, since 1940 celebrating the city's famous lakes, rivers, and streams. Its current tagline is The Ten Best Days of Summer. It is held during the third full week of July and includes some 70 events, including sand castle building, beach volleyball, a tennis invitational, a triathlon, parades, Subway Block Party and the final Target Fireworks.