Who organised this? I mean really organised it and funded it. Back in the day I helped organise marches, it takes time, organisational skill and money and you need outreach with interested parties to get them to chip in and take some of the load. They had stewards, lots of them in high vis vests and organisers on the ground with megaphones, and they must've had coaches to get people from across the country to London, so there would've been set pick up points in various towns and cities, drop off points in London and then pick up points to get them back. Those flags didn't appear from nowhere so they had to be produced and distributed and how was the march advertised, how did they get the message out to those that wanted to attend?
Who was on the organising committee that liaised with the Met? Who ran this show coz I'm damn sure it wasn't Robinson.
Anyone who has organised even a small gathering knows it's like herding cats, something on this scale requires organisational skill and deep pockets.