A wave of high-profile concert tours from Meghan Trainor, Zayn, Post Malone, and the Pussycat Dolls has been canceled or postponed in recent weeks. Fans on social media noticed the pattern first: seat maps on Ticketmaster showed floods of blue dots, the icons representing unsold tickets. The phrase “blue dot fever” was born. The official explanations for cancellations cited personal reasons. The data tells a different story.