Sorry, Opus 21 was on North Terrace Hackney, not Kent Town - (this is an extension of North Terrace Adelaide).
Another memory of Masters Apprentices was their velvet suits! They also played at 20 Plus club in Grote Street, Adelaide - a larger venue (amongst others). I don't recall being over 20 when I went there LOL.
Searched for info about Opus 21 & 20 Plus club to no avail.
