Rising Event

[Claviusnex]

So perhaps it's something like different worlds getting a chance at different times, to ensure everyone can get into an instance when it becomes available? Instead of sending the servers into meltdown as everyone tries to do it at once.

Although if so, it could really do with some kind of "X minutes until the event begins" person you can talk to.

If that is true it would also have been nice for SE to explain how it worked.