You cannot travel on a tourist visa because that does not permit you work at all.
Here are the possible visas that you could apply for.
What can event participants do to help with the visa application process?
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, making sure that the visa allows for the purpose of visit to Australia. For example:
- attendees, amateur performers, and volunteers (who will not be paid to participate, other than to be reimbursed for reasonable expenses such as accommodation and meals) may be eligible for a Visitor visa.
- invited participants and speakers (whose principle intent is to impart information/facts) might be eligible for a Temporary Activity visa (subclass 408) as an invited participant in an event.
- performers, entertainers, and other persons intending to work in the entertainment industry in Australia (including, but not limited to, directors and producers) might be eligible for a Temporary Activity visa (subclass 408) in an entertainment activity.
- workers (including, but not limited to, exhibit installers, constructors of stands/event products, supervisors and organisers) might be eligible for a Temporary Work (Short Stay Specialist) visa (subclass 400).
You are best to contact the Australian High Commission in London and apply and show them the invitation you have and they will be able to assist.
From what you are describing I think you would be seeking a subclass 400 being the last on the list
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