Dunedin i-Site visitor centre 2IC Peter Campbell said while most commercial accommodation was booked out, there were still options available.
''We do still have quite a number of rooms available,'' he said.
''The motels are pretty much full but the bed and breakfasts, there are some available on the outskirts [of the city].''
While people might not get their ''preferred option'', the visitor centre could still find a bed for those wanting to attend the concert or visit the city, he said.
Enterprise Dunedin director John Christie said millions of dollars would be pumped into the economy from the weekend.
''It will be bringing people into the city from outside the area who otherwise wouldn't be here,'' he said.
The benefit to the city was not only financial, he said.
''They give us a culture that adds to the vibrancy of the city. It's not solely based on the economic return.''
It is unclear how many tickets to the Neil Diamond concert have been sold, but it is understood a crowd of more than 20,000 is expected.
Dunedin Venues marketing and communications manager Kim Barnes said the promoters did not want to release details of ticket sales until after the show.
''We are very pleased with the ticket sales,'' she said.
''There are still some tickets available.''
Mr Campbell said accommodation was also ''pretty much chocker'' for Fleetwood Mac's November 18 concert in Dunedin.
I-Site staff had been busy finding beds for concert-goers as far afield as Oamaru and Middlemarch.
The same was not yet true of Black Sabbath's April 30 concert.
There was ''plenty of accommodation available''.
However, he recommended that people visiting the city for the show book their accommodation soon, as ''I do expect that to change''.
Mr Christie said the coming tourist season would be busy for the city, with several large conferences on top of the concerts.
''It's going to be a really full season ... with a number of exciting events in the city and we are going to see good strong numbers,'' he said.
''It is a rising tide. We are seeing it across a number of levels of activity with concerts, conferencing and other major events being held in the city.''
A Ngai Tahu delegation of about 1500 people will visit the city next month for the runanga's biennial Hui-a-Iwi.
It was only one of a number of events and conferences to be held in the city for the first time, Mr Christie said.
''We have lined them up for years to come and are still bidding for more.''
