Australia Entry Requirements

All attendees to IRG54 arriving from overseas must obtain appropriate travel authorisation before departing their home country. For most attendees, it will be possible and sufficient to obtain an Australian Electronic Travel Authorisation (ETA). An ETA can be obtained quite simply using the Australian Government's app, downloaded to their phone or other device. 

If your mobile or tablet device uses the Apple Store, to download and install the app please go to this link:
https://apps.apple.com/au/app/australianeta/id1527982364

If your mobile or tablet device uses Android apps, to download and install the app please go to this link:
https://play.google.com/store/apps/details?id=au.gov.homeaffairs.eta&hl=en_US&gl=US

If you find that the app doesn't cover your situation, you will need to check the Australian Government website for Australian entry requirements specific to your situation. Please check your eligibility and Visa needs to gain entry.

While this Australian Government site is the most authoritative and sure to be up-to-date, this Wikipedia webpage more simply explains the various options depending on your location and situation.