Facilitators
Who's leading & guiding the workshop?
Who facilitates the workshop is one of the most consequential decisions in the plan, and often one of the last to be settled.
The facilitator or facilitators are the people who hold the process, read the room, and guide the group through the day. This is not the same as knowing the subject well, or being the most senior person in the room, or having organised the logistics. Facilitation is a distinct role, and conflating it with other roles is one of the more reliable ways to produce a workshop that drifts.
If more than one person is facilitating, you need to be explicit about who leads which parts, how you hand off between each other, and what the support role looks like when one facilitator is in front. Two people who both think they are the lead will subtly compete; two people who both think the other is the lead will leave gaps.
The choice of facilitator also carries a message. Who is in front of the room signals something about whose authority and perspective the day is built around. In some contexts, a neutral external facilitator creates safety that an internal one cannot. In others, a familiar face is what the group needs to settle in.