I want to know the answer to the following question:
What organization said Oklahoma's centennial was the top event in the US that year?
All the background I'm provided with is that "Annual ethnic festivals and events take place throughout the state such as Native American powwows and ceremonial events, and include festivals (as examples) in Scottish, Irish, German, Italian, Vietnamese, Chinese, Czech, Jewish, Arab, Mexican and African-American communities depicting cultural heritage or traditions.". Is that enough to answer the question?