In the past, whenever Creative or other game modes have been "turned off," it's usually because Epic Games had a meaty in-game event planned for the island, and since Creative games take a while to play, it's easy for players to miss said event. Once the event was over, Creative mode started right back up.

And it looks like that's what's happening right now. The Astronomical event just started, and @FortniteStatus tweeted to keep worrisome fans from flipping out too hard when they tried to get into a Creative mode but couldn't.