Before you put on that skeleton costume and rove door-to-door pandering for candy, take a minute to reflect on this tradition. Halloween is believed to have come from an ancient Celtic
festival dating back some 2,000 years. November 1st was the Celtic New Year and marked the
end of summer to the Celts. They celebrated on its eve by wearing costumes made of animal
skins and dancing around bon
fires. Over the next two millennia, this primitive celebration grew
to be the candy fueled costume ball that we know today.

Summarize this paragraph in one sentence. Be specific and clearly explain the main
idea.