Karaku was walking around the infinite castle looking at every structure inside he saw the other Upper-Moon inside there own places with there own numbers

All the Demons are doing there own things like playing with other, talking, or even eating flesh of a human, while you are just in your place not leaving there

Muzan then order Nakime to summoned everyone in the hall to talk about the mission to find the Blue Spider Lily and also to introduce you as his hidden Demon child to everyone