An Impossible Task, But Who Knows?

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Based on my U.S. collecting experience, this cover looks like it was mailed at a temporary postal station set up at the festival. Note the date in the cancel is within the time span of the event.

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A temporary post office will be located in the Treasury
Gardens, Melbourne,during the Moomba Festival over the period 26 February,
to 8 March
1971.
The post office will be adiacent to the Victorian Philatelic
Association Stamp Display, in which the Australian Post Office is showing
some of its historical philatelic material.
A pictorial postmarker will
be used at the temporary post office. the design of the postmarker will
be similar to the one used in 1970.
Collectors in Australian may obtain impressions of the postmarker
or lodging fully stamped and addressed covers at the Russell Street Post
Office, Melbourne, or by posting them under prepaid cover to the Postmaster,
Russell Street Post Office, Melbourne, 3000, up to 25 February, 1971.
Thereafter, covers should be sent fully addressed and stamped
under prepaid cover to the Postmaster, Mombasa Festival Post Office,
Melbourne 3002, to reach him not later than 8 March, 1971, or be posted
at the temporary post office.
Overseas collectors should forward fully addressed but unstamped
envelopes to the Philatelic Bureau, 374 Bourke Street, Melbourne, Victoria,
Australia, 3000, with a remittance to cover the cost of the stamps to be affixed.
These orders must reach the Bureau by 8th March, 1971.

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There is a "postal" fingerprint or two in the purple and yellow areas between the boats.