The rally in Melbourne hasn’t gotten much coverage because of Sydney, but it is mentioned here. They clIm 3000 attended but that’s way off, it was easily 25-40,000 (some estimates I’ve seen go as high as 50k). The march stretched down most of Bourke St and I couldn’t see the start or end of it.

300k was the organiser estimate for Sydney which is about 5-6% of the city.