https://www.gamespot.com/articles/fortnite-battle-royales-50v50-mode-returns-again-f/1100-6458899/

Another limited-time event is now underway in Fortnite: Battle Royale. In addition to the ongoing Avengers-inspired Infinity Gauntlet Mashup event, where you can play as Thanos, Epic has brought back 50v50 mode for a third run on PS4, Xbox One, PC, and iOS.

What's particularly notable about 50v50's return is that it marks the first time that two limited-time modes are running concurrently in Fortnite. Previously, Epic would only host one limited-time event at a time, which would rotate out after about a week and be replaced by a different mode. Whether or not this will become the norm moving forward remains to be seen, but it gives Fortnite fans yet another incentive to keep coming back to the game.