Do you prefer a handheld microphone or a lavalier? Some officiants speak in a warmer register with a handheld in front of them. Others gesture too much for a handheld to work — a lavalier keeps their hands free.
Do you plan to project? Officiants trained in theatre or ministry often over-project into a microphone. We adjust gain to match — but only if we know in advance.
Will you use a written script or read from a phone? A phone tilted forward blocks a lavalier. A written script rustles. Both are solvable if we plan for them.
Where will you stand? A three-foot difference changes the acoustic entirely.
Will there be a unity moment or a signing? These are the two most common places we lose audio — because the mic moves and no one accounts for it.