https://www.pcgamer.com/fortnite-adds-quadcrasher-and-in-game-tourneys-disco-domination-rolls-over/

In-game tournaments are coming to Fortnite in the 6.1 update—both of which are now live. Likewise, the battle royale 'em up has rolled out the Quadcrasher vehicle, and has extended the Disco Domination limited time mode's stay on the island. 

As reported by Andy yesterday evening, in-game tournaments are open to everyone, and pit competitors on all platforms—and all types of control setups—against one another other "as equals". A new 'Events' tab has been added, explains v6.10's patch notes, along with several in-game tournaments.