Actually, when we reported at the time listed on the invitation, the NPC acted like it wasn't time yet. When we reported two hours later (as the invitation is in pacific time, not central time), she greeted us and SAID that the hour was upon us. She said she was teleporting us into the separate dressing rooms AND we both proceeded to get the loading screen, then were booted back into the Shroud with the message above.

tldr; we tried multiple times/time zones to make sure. The invitation is definitely in PST while we are CST...