I'm writing a dialogue heavy scene. The protagonist has met with a group of mercenaries that he spent a great deal of his younger days with. He doesn't come to them for a catch-up however, he has ulterior motives for the meet.
The protagonist is sat at a table with his three old friends. He's filling them in on a prior event (one that happened away from the pages of the book).
Here's my question...
As the protagonist is doing 70-80% of the talking, how to I involve the user enough so that they don't forget about the other characters? For example, the protagonist directs a question at Person A, and they riff on this question a little together. How do I involve Person B and C enough in this part so that they don't disappear from thought?