Melbourne has the ballrooms this music was written for, and that is the practical reason the city carries the choice it does. The old hotel rooms along the river and through the city centre have the ceiling height and the stage depth a horn section needs, which a modern function box built for a hundred people does not. Match the band to the room and you will enjoy the night far more than by ordering the biggest lineup you can afford.
Depth is the measurement people forget, because a stage that photographs wide can still be two metres from front to back. Ask the venue how far the platform runs backwards, where a drum kit and a double bass get through the door, and whether there is light enough on the stands for players to read by. Hand those three answers to the bandleader and let them tell you what will honestly fit.
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Think of it as a wage bill rather than a booking fee, since the money divides between a dozen or more professionals who have each given up their Saturday night. That is why pushing on the total gets you nowhere and why changing the lineup gets you somewhere: fewer horns playing the same arrangements is a real saving. Look at the starting figures on this page across the different configurations rather than across the band names.
Stage depth, honest access for a double bass and a drum kit, power near where the band stands, light to read charts by, and somewhere for the cases. A tight corridor load-in adds real time to the setup and a rushed setup is audible in the first three numbers. Get the measurements from the venue and hand them straight to the leader.
Only in a room with the space for it, and most Melbourne reception venues do not have it. Where it works is a large hall or a marquee where the band becomes part of the staging as well as the sound. If a leader steers you towards a smaller horn section for your particular room, take that as expertise rather than a soft no.
More than most people allow. Getting a group this size in, laying out the rows, lighting the stands and checking the sound is not a half hour job, and a venue that opens its doors to you only shortly before the guests arrive may quietly rule out half your shortlist. Put your access time in the enquiry so nobody quotes on an evening that cannot physically happen.
Most Melbourne bands of this size have a smaller version with the same leader and the same written arrangements. Asking which ones they offer is a far more productive first email than asking the full lineup to sharpen its pencil.
A dozen musicians turn up in a dozen cars, each with an instrument, and Melbourne's city venues are unforgiving about where any of it goes. Find out what the loading dock allows and where the cars can sit all evening, then tell the band what you have arranged.
Some of these groups are instrumental and add a singer as a separate fee, others quote with the voice included. It changes the character of the night as much as the number, so get it confirmed rather than assumed.