Lakota powwow and White Horse Ranch - South Dakota Forum. Lakota powwow and White Horse Ranch. A traditional powwow is held the last week-end in July every year at Milks Camps Park SD(Milks Camp) which is north of Naper, NE. Naper, NE is right on the NE/SD border. It is rich in tradition and provides a unique opportunity to observe Lakota customs.