Which shopping festival pioneered the concept of 'blind boxes' (mystery cultural collectibles) that has now become a global retail trend during festive seasons?

Shopping festivals have evolved to become significant cultural events worldwide, blending traditional celebrations with modern retail strategies. These festivals often incorporate unique cultural elements while driving massive sales volumes. How well do you understand the intersection of cultural celebrations and retail innovation? Test your knowledge about how global retailers leverage cultural festivals to create unique shopping experiences.

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Singles' Day (China)
Black Friday (United States)
Diwali Shopping Festival (India)
El Buen Fin (Mexico)