Which question is not answered by the Article?

What has become the crowning event at many of the Indigenous Peoples' Day celebrations?
What do vendors often set up at tables and tents to sell at Indigenous Peoples' Day celebrations?
Why was contact with Europeans such a catastrophic shift in the history of Indigenous people?
Why did government agencies attempt to suppress the history and heritage of Indigenous people?

Why do some people still celebrate Columbus Day instead of Indigenous Peoples' Day?