https://www.gamespot.com/articles/fortnite-in-game-tournaments-feature-starts-up-tod/1100-6462544/

Fortnite v6.10 will add in-game tournaments, Epic has announced through its official site. Tournaments will be scheduled events open to all players to get in over the course of several hours and win as many points as they can. If you achieve the score goal, you'll get a pin to celebrate. Some special tournaments will use the pins as qualifiers for the next tier of a tournament or to win prizes.

Tournaments will be open to all players, but you'll need to opt in for crossplay to compete. All players participating in a tournament will be treated as equals regardless of their control input--mouse and keyboard, controller, or touch. Epic says it was carefully watching pro players during the Summer Skirmish, PAX West, and Fall Skirmish events, and have concluded that controller players can be a match for mouse-and-keyboard players. The studio will be continuing to look at the competitive landscape and may offer limited tournaments for inputs or platforms.