https://www.gamespot.com/articles/last-chance-for-fortnite-battle-royales-double-xp-/1100-6458355/

Fortnite's v3.5.2 update is now available for PS4, Xbox One, PC, and mobile, and it introduces a handful of new content to both Battle Royale and Save the World modes. On top of a new limited-time playlist, Epic has thrown in another incentive to play the game this weekend: double XP. [Update: It's the last day of Fortnite's double XP weekend, giving players only a few more hours to take advantage of the below bonuses when playing Battle Royale and Save the World modes.]

From now until Sunday, April 22, all Fortnite players will earn twice the normal amount of XP when playing Battle Royale mode. Save the World fans also have an enticing reason to play this weekend, as Epic is offering free Into the Storm llamas. Players will receive a llama each day they log in this weekend, with four to collect in total.