At Gusaba, protocol is the event
Two families sit facing one another, each with elders who must be seated correctly, and an exchange that moves between spokesmen in a set order. Getting that wrong is not a logistical inconvenience — it is a visible discourtesy, in front of everyone whose opinion the families care about most. This is the single strongest argument for protocol being planned rather than improvised on the morning.
Ushers who know the room
An usher who has seen the seating plan, knows which elders sit where and knows what happens next is worth several who are simply pointing at chairs. Because we draw the room, the people working it already understand it.
The order of proceedings
Someone has to hold the sequence: when each party is received, when the exchange begins, when gifts are presented, when the meal starts. Written down in advance, agreed with both families, and held by one person on the day.