My story has a cast of 59 characters, 25 of which are either protagonists or antagonists. Nine of these characters are very well-rounded and important, and most make an appearance at least once in each book.
Though not the MC, my favorite character of the entire series is one of these nine and is extremely important to the plotline. Long story short, he fakes his death later in the book.
Because I have such a large cast, the main problem I run into is that I have too many characters in one place talking at once and they all have something to say, like on a group chat with twenty people and it all comes out choppy and disorganized.
These nine, important characters are all surprised because they thought my favorite character was dead, and of course, they all have something to say about it, so, what are some tips for writing dialogue when you have a large group of characters in one place?