PAG in Sydney have had regular rallies basically every weekend since the conflict reignited on Oct 7. Some critics in allied groups were concerned that this would lead to a sense of fatigue, having constant, smaller, easily-missable rallies as opposed to having a big notable one each fortnight or month. And in my limited experience, crowds did get smaller over time until a big event spiked interest, like the invasion of Rafah, bombing of Lebanon, bigger Australian foreign policy actions, etc., so I can understand that perspective, especially when I assume Adelaide has a smaller and less mobilised population to draw from.
Definitely keep an ear out for any counter-rally there on the 31st, I can’t see any announcement of one yet.