The Gold Coast probably books more acoustic duos per head than anywhere else in the country, and it is a supply-and-demand thing rather than a taste thing. A beach ceremony at Burleigh, canapes on a Broadbeach terrace and a long dinner set in a high-rise function room all want two players and no drum kit. The duos below do that work most weekends.
The catch is that the busiest players hold residencies at venues up and down the strip, so the Saturday you want may already be committed to a pub. Ask about your exact date early, and ask whether the duo in the video is the pair you will get, because the singer and the guitarist here often work with several partners.
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The usual shape is acoustic covers through the ceremony and canapes, then a fuller set with backing for the reception once people have eaten. Plenty of duos here will handle the aisle song and the signing music as part of the same booking rather than as an extra. Give them your three key songs and let them build the rest around the room.
They can, and it's a weekly job for a lot of these players, though it needs a battery-powered PA because there's no outlet on the sand. The two real enemies are wind, which carries a voice straight out to sea, and the surf itself, which is louder than people expect at Burleigh or Snapper Rocks. Set the ceremony so the guests have their backs to the water and the sound has somewhere to go.
For a ceremony on public beach or parkland you generally need council permission, and that application usually covers amplified music as well as the chairs and the arch. Sort it well ahead, because a knocked-back permit a week out is a bad week. Your celebrant or venue coordinator will normally have done it before and can point you at the right form.
Most cover the whole strip from Coomera down to the Tweed without adding travel, and plenty will come up to Brisbane or out to the hinterland for a fee. A Mount Tamborine or Numinbah Valley booking means a mountain road in the dark afterwards, so expect that to be priced in. Have each duo itemise the driving on its own, because otherwise two quotes are not really measuring the same thing.
A beachfront ceremony at Currumbin or Coolangatta means a speaker and a guitar in blowing sand and sea air. Ask what the duo brings for that, and give them a solid flat surface to set up on rather than the sand itself.
A function room forty floors up means a service lift booking, a trolley and a long wait. Sort that with the venue before the day or the duo spends their setup time queuing.
Duos here often swap partners around residencies and weddings. Confirm which two people are playing when you book, not just the act name.