Sioux Falls to Commemorate 9/11 with ‘Step Up for Heroes’ EventSioux Falls to Commemorate 9/11 with ‘Step Up for Heroes’ EventA number of people throughout the Sioux Empire will help commemorate the 20th anniversary of 9/11 on Saturday by participating in the 7th annual "Step Up For Heroes" event. Marc ElliottMarc ElliottDakota News NowDakota News Now