Where “Amazon Prime Day 2015” started

Amazon, on Open web, Jul 6, 2015. It reached 5 platforms in 12 months.

LineageContestedKey steps, 8 of 16. Lines follow time and platform
AmazonFirst postThe VergePressWalmart Answers Amazon's "Prime Day" With Deals And Free Shipping | TechCrunchWalmartOpen webBacklashPlatform jumpPeak proxyCommercialAfterlifePatient zero