There is one more group competition picture and this shows the scene at 9pm at Parramatta on Friday 14 November 1913at the start of the Sydney Bicycle and Motor cycle Club's 24hr Reliability trial. The Trial started at Parramatta, with the first checkpoint at Hartley, then Bathurst, Sofala, Hill End, Mudgee, Capertee, Wallerarang, and back to the finish at Parramatta.
In the photo can be seen Arthur Biden, of Biden and Roberts, in the centre with pipe, standing immediately behind him and partially obscured appears to be Edgar Meller (future campaigner of, and winner of the 1914 Grand Prix on, a 2 3/4 TT Douglas).
Standing on something in the left of the photo towards the back wearing the suit hat and bow tie appears to be William McCarthy, who for many years was an organiser of events as well as a competitor. He owned the Bennett and Barkell Agency in Wagga Wagga, from 1908 to 1916. He organised racing at the Wagga showground and attended both the 1914 TT and GP.
I hope Leon can provide some of his excellent machine identification skills.
Peter