Sea of people march across Sydney Harbour Bridge calling for an end to killing in Gaza
(www.theguardian.com)
Not an expert either but I’ve been to rallies with a conservative estimate of 30k and this was easily several times larger from only what I could see.
The police actually asked people to stay put and await further instructions. Apparently their plan was to stagger the crowd back. But one people couldn’t progress north any further every one just turned back anyway. It was all quite orderly, thankfully.