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.
how many people attended?
attended by an estimated audience of 200,000.
what did he do next?
1967 Australian television special The Seekers Down Under.
what role did he play?
CANNOTANSWER.
did he win any awards?
in recognition of its achievements, the group was named joint Australians of the Year - the only group to have this honour bestowed upon it.
why did it have this honor?
in recognition of its achievements.

Question: which achievements?
Self-contained rewrite: For which achievements did the Seekers win the awards?