https://www.gamespot.com/articles/pubg-adds-fortnite-battle-royale-like-limited-time/1100-6457607/

While Fortnite's free Battle Royale mode was clearly inspired by PlayerUnknown's Battlegrounds, one of the ways it sets itself apart is by offering limited-time game modes. These special events are only available for a few days and introduce a unique twist on the typical gameplay, like the ongoing Blitz mode that features shorter match times than usual. Now, PUBG is following suit and offering its own limited-time modes on PC.

In a post on the Steam forums, developer PUBG Corp. announced it is adding a new Event Mode to the popular battle royale game. Just as in Fortnite, PUBG's Event Mode will periodically introduce new types of matches that aren't typically available to play, and they'll only appear in the rotation for a limited time.