Miko talked a bit about the Christmas party at Hoshimachi's:
https://youtu.be/QWSGTfX6wHQ?t=16360In addition to the Fubuki Christmas Party stream gang, Vivi and Chihaya went to the Hoshimachi Christmas Party too. Mamamachi and Anemachi were alo there. In the morning Suisei had sent Miko a LINE with instructions for all the errands she needed to run, one of which was procuring roast beef for the party. However, Anemachi had also bought the required amount, so a lot of rosbif was left over to the point that people did not only take it home but Miko at least proceeded to distribute it to staff at the studio. Miko likened the array of food present to a hotel buffet. The best food on offer according to her opinion was Anemachi's beef stew.
Suityan had bought Christmas presents for everyone, others had also brought presents; underneath the tree was filled with them. Suisei had apparently taken a great deal of thought in what to gift whom: Miko's present was huge. It turned out to be a popcorn maker from Toys'r'Us that's safe to use for 10 year olds. Miko wanted to (did?) leave it at Suisei's place because it was so big it's hard to find space for it and she can use it anyway while staying over. Miko got Anemachi and Mamamachi a thoughtful present too; her mother had nagged her about the necessity of it because she's indebted to the Hoshimachi family.
As a tip for any anons going to the concert, Miko's chat were recommending motsu nabe, mizutaki, Hakata ramen (apparently even the ones sold at train stations and airport are good), and of course mentaiko for Miko to eat while at Fukuoka.