Marshmello played a concert for 10m people in Fortnite

"Yesterday (February 2), DJ star Marshmello played an exclusive in-game concert in Fornite at 2pm ET. Fortnite players could watch the virtual show for free, so long as they made sure their avatar was available at the concert’s location (Pleasant Park).
The numbers are now coming in on the event’s audience, and they’re mighty impressive: according to reliable sources, over 10 million concurrent users witnessed Marshmello’s virtual concert. These people’s in-game avatars were all able to hit the virtual dancefloor in front of Marshmello’s own avatar and show off their moves.
Fans now can, and no doubt will, buy official Marshmello X Fortnite merch – with a hooded sweatshirt setting you back no less than $55. (Youth sizes are, of course, available.) And the official extended mix of the Fortnite set is available exclusively on Apple Music."
Source:  Music Business Worldwide, 3rd February 2019