From Australian sf information
Rather than hold the convention over the Australia Day weekend, as was the tradition for non-Natcon Swancons, the decision was made to hold Swancon Twenty3 over the ANZAC Day weekend. This gave the committee an additional three months' lead-time to prepare the convention and publicise the event.
In late 1997 British author Douglas Adams was approached about attending Swancon Twenty3 as a second International Guest of Honour, as he was expected to be in Australia at the time promoting the videogame Starship Titanic. While Adams initially agreed to appear, his participation in the convention did not ultimately eventuate.