All visitors to Australia must have a valid visa to travel to and enter Australia (other than New Zealand passport holders who will normally be granted a Special Category visa on arrival, provided they meet health and character requirements; and permanent residents of Norfolk Island who may be granted a Permanent Resident of Norfolk Island visa on arrival).
If you are planning to visit Australia to participate in a business event such as a conference, trade fair or seminar or expo, and you are not being paid by an organiser for your participation in the event, you may be eligible for an ETA (subclass 601), eVisitor visa (subclass 651) or Visitor (Business Stream) visa (subclass 600). (Border.gov.au 600/601/651 Visas)
For more information on Australia border control & visa regulations, please refer to (www.border.gov.au)
NOTE: If a paper visa is required processing may take up to a month so please apply as soon as possible.