I’d agree with Chad on just about everything, especially keeping the info simple and minimal.
I worked in a D3 program that produced many successful multi-eventers, and we coached by committee, but with one person (me) coordinating all event work schedules to make sure it fit correctly into the overall program. I was the “meet day” coach who accompanied the crew to the multi competitions.
I would always try to get around and watch the interaction and cueing of the various event coaches during regular meets, and I would specifically get around to see at least 1-2 sessions in the week prior to a multi. We were fortunate in that we were a close coaching staff and I was really only dealing with 2-3 people outside myself. I would discuss with both the athlete and the coach what we should expect, what we had been working on, how they took various cues. We focused on a few cues, the less the better, for the meet. Everything was rehearsed. They tended to do very well and our system worked because everyone played their part correctly. There were no cowboys, and the athletes had a strong voice in these matters. I always joked that I was simply a facilitator. The athletes always said that they enjoyed the coach by committee thing because of the diversity, but unity was actually the focus. One caveat: we had a talent run and good chemistry.
Many of those athletes are now very successful coaches…multi athletes make the BEST coaches, I think.