Which retail loyalty program holds the Guinness World Record for 'Most people attending a loyalty card event' set in 2019?

In the competitive world of retail, customer loyalty can make or break a business. Some brands have achieved such phenomenal loyalty that they've earned places in the record books! This trivia question explores an extraordinary achievement in customer loyalty that secured a Guinness World Record. Test your knowledge about exceptional brand devotion that transcended normal shopping habits and created retail history.

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Walmart's 'Savings Catcher' with 12,847 attendees in Dallas, Texas
Tesco's Clubcard with 14,503 attendees in Manchester, UK
Amazon Prime Day celebration with 13,921 attendees in Seattle, Washington
Alibaba's Singles Day with 15,210 attendees in Shanghai, China