Band is the widest word on this site, and in Brisbane it covers everything from three people with an acoustic set to a nine piece with horns. So the first decision is not which act, it is how many players your room and your night can take. Get that right and the shortlist below shrinks to something you can actually work through.
The second thing to settle is where the sound comes from. Brisbane's RSLs and larger function rooms often have a house system the band can plug into, while a garden, a shed or a hall means the band brings the lot. That single detail moves a quote more than almost anything else, so put it in your first message.
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Count the people first, because that is what you are really paying for, then add hours and equipment. Four musicians for three sets in a room with its own PA is a very different quote from six musicians with full sound and lights in a marquee at Samford. The from-prices on the list below are what Brisbane bands are asking now, and most will price a smaller version of themselves if you ask.
A ceremony is a short booking with a long setup, so it is priced as a block rather than by the hour, and one or two players from a band is the usual arrangement. In Brisbane many ceremonies are on lawns and verandahs with no power nearby, which means battery sound, and that is worth confirming rather than assuming. If the same musicians are staying for the reception, ask for the combined price, because it is almost always less than two separate bookings.
Function bands generally do, pub bands often expect the venue's rig, and the two get confused constantly. If your event is in a hall, a shed, a marquee or someone's garden, say so plainly and confirm sound and lighting are in the quote. A band arriving at a private property with nothing but instruments is a problem nobody can fix on the day.
Three sets across a four hour window is the common shape, and it fits a Brisbane wedding well because the speeches and the meal sit between sets. Outdoor venues here sometimes have a noise cut-off earlier than you expect, so check the hard finish before you buy a fourth set. If the party is running on after the band stops, agree who is playing music instead.
A five piece needs room for a drum kit, amps and a bit of front. If your dance floor is small, a smaller band with a bigger sound system usually gives you a better night.
Three sets of forty five minutes with music through the breaks is the standard shape. What you want to know is what plays between sets, because silence after the first one flattens a room quickly.
Brisbane's outdoor event run from about May to September is when everyone wants a band outside. Those Saturdays go months ahead, while the wet summer months are far easier to fill.