All visitors to Australia must have a valid visa before boarding their plane regardless of the length of stay.
Those who are being paid by an organisation in Australia for their participation in a conference need to apply for Temporary Work (Short Stay Activity) (Subclass 400 ) visa. Please note that IDF is the Congress Organizer and is based in Belgium.
The passport which you hold determines whether you can apply online, or if you need to lodge a paper-based application.
Information regarding Australian visas for event participants can be located on the Australian Department of Immigration and Citizenship's website .
For the best possible chance of obtaining a visa to travel to Australia to attend an event, you should:
- Determine which visa you should apply for
- Apply for your visa at least 6–8 weeks before your intended date of travel to Australia (or two weeks for online applications) as visa processing times may vary
- Consider Australia's health and character requirements, which you will have to meet as part of the visa application process
If you are not from an eVisitor or ETA eligible country, ensure you obtain a confirmation of your registration to attach to your paper-based visa application.
Paper-based visa applications must be lodged at the Australian visa office nearest to your current country of residence. To find the nearest visa office see: www.immi.gov.au/contacts/overseas/index.htm 
Important: A confirmation of registration will not guarantee the grant of an Australian visa. In order to be granted a visa you must meet all the legislative requirements of that visa.
Please note that these are the visa options available presently but the Department reserves the right to change regulations.
For further enquiries regarding obtaining an Australian visa, kindly contact the Australian Department of Immigration and Citizenship