There's very little in-game guidance for how it works.
I have farmed the splinters, and gotten the keys. Great! Now what?
Not all of my guildmates have the keys. If I help them farm their keys, do I get more keys? Can I only do each dungeon once per key or do they remain unlocked? If I do the dungeons but not the trial can I farm more dungeon keys? Can I only do the trial once?
The zone is cool, the concept is there, but it's unnecessarily complicated and grindy. Worse of all, no one seems to know how it works. I've gotten conflicting reports from people.
Before the next event, I'd love some adjustments to how this all works. As is, it's very hard to get everyone on the same stage.