Which ancient civilization hosted the 'Festival of Opet,' a 27-day shopping festival where merchants set up elaborate market stalls alongside religious processions?

While modern retail focuses on Black Friday and Singles' Day, ancient civilizations had their own sophisticated commercial celebrations and retail promotions. These events often combined religious observance with massive market gatherings that boosted trade and showcased exotic goods from distant lands. Test your knowledge about one of history's earliest documented shopping festivals that influenced commercial practices for centuries!

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Ancient Egypt (during the New Kingdom period)
Mesopotamian Sumerians (during the reign of Gilgamesh)
Indus Valley Civilization (at Mohenjo-daro trading center)
Ancient Greece (during the Olympic Games)