I don't know who the parade was for but this news clipping from 1927 lists a who's who of Canberra pioneers shortly before their passing. Names with associations going back to 1835 fill the 70 year gap from Canberra's (Limestone Plains) European discovery in 1822 till the founding of Canberra as Australia's National Capital in 1913. I think the article with references to well known Canberra landmarks adds a human touch to the Limestone Plains period...
The Canberra Times - 13 May 1927
National Library of Australia