The 87th Annual Sioux Empire Fair is happening now in Sioux Falls at the WH Lyon Fairgrounds. Bringing families together at the Sioux Empire Fair was a significant reason why fair officials decided to implement curfew hours for any fair attendee under 17 years old. Since then, Sioux Empire Fair staff have continued this trend "in order to maintain safety of everyone at the Sioux Empire Fair." In a Facebook post from the Sioux Empire Fair, there was a friendly reminder about this policy for all Sioux Empire parents and guardians. South Dakota Foods You Must Try Some foods are distinctly South Dakota.