Tech Singles Day has become a multibillion-dollar mega-event. Here’s how it got so big November 9, 2018Uptin Saiidi, CNBCComments Off on Singles Day has become a multibillion-dollar mega-event. Here’s how it got so big It's huge outside the U.S., much bigger than Black Friday. Last year, it generated a whopping $25 billion in sales — all in just a 24-hour period.