The 143rd annual Ponca Celebration, or Powwow, will be held at historic White Eagle Park Aug. 22-25. The theme of the Powwow this year is “Where Champions Meet Champions.” The various events will be held in both the Augustus McDonald Arena (also known as the Main Arena) and in the Thomas Roughface Arena (also called the South Arena). Thursday, the 22nd, will feature the Tiny Tots (age 5 and…