Conversation so far:
when did The Seekers return to austrailia?
In March 1967, The Seekers returned to Australia.
Are there any other interesting aspects about this article?
homecoming tour.
what was the homecoming tour?
included a performance at the Sidney Myer Music Bowl in Melbourne.
did he win any awards?
Guinness Book of World Records (1968) listed it as the greatest attendance at a concert in the Southern Hemisphere.

Question: how many people attended?
Self-contained rewrite: how many people attended the Seekers' concert in the Southern Hemisphere?