The communication artifact isn't working.
Vanyel usually checks in with Savil once per Velgarth week; he was doing it daily for the first few days of Leareth and Maitimo's visit but it's been uneventful and he stopped a while back. So it's just the routine chat, now, and he isn't particularly worried, yet, but he's worried enough to Mindspeak Stef directly even though he's in the middle of a concert, and then head for the Gate-terminus. Using the permanent Gate is easier than casting the communication spell directly, and if the issue is that their artifact is broken, he may be needed to fix it anyway.
The Gate doesn't work.
Vanyel spends a few minutes, in hindsight probably longer than is justifiable, checking it for problems on his end. But the power-source link is intact and nothing else seems different from how it should be, and–
:Stef, we have a problem. Gate's down. I'm going to Vinyamar right now: Normally he would escalate this to Maitimo first, but Maitimo isn't here and Vanyel is suddenly very, very concerned about this fact. He'll - hmm. He'll go to Vinyamar and see if Fëanáro is interruptible, because obviously he needs to know, and if not he'll go for Macalaurë or really any of Fëanáro's other children.