From US slave to New Zealand mayor

Here's one I might have posted two days ago, had I had the information then:

June 24, 1860 (?) Robert Bradford Williams (d. 1942), African-American lawyer (Class of 1885, Yale), born a slave in Georgia.

He was a 'black minstrel' in Australia in the late 1880s, and later the longest-serving Mayor of Onslow, a suburb of Wellington, New Zealand (more)

Do you have any more information on minstrels, such as Williams, the Fisk Jubilee Singers, Virginia Jubilee Singers and Orpheus Myron McAdoo, as they pertain to Australia? If so, I am interested – please contact your almanackist.