@FightfulSelect
(free tier) reports that a venue change for AEW Grand Slam: Australia is likely, with an announcement expected sooner rather than later.
Over the past week, the current seating map changed significantly, with many seats removed and numerous sections becoming untrackable. While it was unclear if the map was in transition, there have been no further changes since then, and it now shows limited ticket availability.
The show was originally scheduled to take place at Suncorp Stadium in Brisbane, AU. Initial VIP sales were encouraging but after that, much of the map was still available in large quantities of available tickets.