Filming for Meglopolis: backstage scenes
The information about the filming is based on the call(s) for extras. Grace may not necessarily have been involved in the shoot on all of these days, and she will have been shooting on other days as well, doing scenes where no fans were involved. There is, at the time of writing (the day after the event), no Grace-related media for this event.
In the IG Live on Feb 26th, Grace stated that Jan. 31st would be her last day of filming; however, the call for extras included Feb 1. where they would be interacting with the artist. So we presume Grace was mistaken about what day would be her last day of filming.