https://en.wikipedia.org/wiki/Singles%27_Day has more info. It's the biggest single shopping day on earth. The Verge says today's sales were double last year's Black Friday and Cyber Monday sales combined.
The First World War has essentially no resonance in China which is why 11/11 was available. Some European retailers have been trying it on but my guess is there will be resistance anywhere Armistice Day is a thing.
I bought nothing today.