>>62087676Ame previously indicated she would not be travelling to Japan for a long time after the last JP arc
The decisions about this event were probably planned afterwards, and it's possibly Ame created plans of her own that got in the way.
Promise was already all there for their showcases, which is probably when most or all of them recorded their segment.
Ina is presently there and will probably record her bit.
Kiara will be there soon, and will record her bit.
Gura is supposed to be getting a 3D live by the end of the year, so she has either already gone incognito or will be travelling soon.
HoloID both have already been to Japan often in the past few months and could easily travel on relatively short notice.