Which holiday retail promotion strategy, pioneered in Japan, has transformed Valentine's Day into a two-day celebration that significantly boosts confectionery sales across East Asia?

Traditional cultural celebrations represent massive retail opportunities worldwide, with businesses developing specialized marketing strategies to engage consumers during these periods. From customized product offerings to cultural sensitivity in advertising, companies must navigate complex cultural landscapes while maximizing sales potential. How well do you understand the intersection of cultural traditions and retail marketing strategies?

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White Day - Men reciprocate gifts to women exactly one month after Valentine's Day
Golden Week Shopping Festival - A week-long discount period coinciding with multiple national holidays
Harmony Day - Couples purchase matching items that represent relationship longevity
Double Heart Promotion - Retailers offer buy-one-get-one deals on all romance-themed merchandise