The issue below has been confirmed.
We are currently investigating the issue and working to address it.

[Known Issue]

■In the Firmament, if the side story quest "Smiles Cross the Sky" has been accepted or completed, the NPC Mariorie will not appear and the commemorative concert is unable to be performed.

We apologize for any inconvenience this may be causing and thank you for your understanding.

[Updated Feb. 16, 2021 at 11:55 a.m. (PST) / 19:55 (GMT)]
This issue was addressed during the maintenance that took place from Feb. 15, 2021 10:00 p.m. to Feb. 16, 2021 2:00 a.m. (PST) / Feb. 16, 2021 from 6:00 to 10:00 (GMT).
We apologize for the inconvenience.