People have gathered in virtual worlds for decades. People have attended virtual concerts for years. Yet the Fortnite event represented something different by many orders of magnitude. By one (unsubstantiated) estimate, 10M concurrent users attended the show in the game’s “Showtime” mode. In other words, this was something much more than a concert. It was a peek, albeit a short one, at what an AR- and VR-suffused future looks like: connected congregations of embodied avatars, in mass-scale events that still manage to feel personal.