I was in a riot once. Involved refusing to go to lessons and running round the school. The deputy head fell over and we laughed. That’s Yorkshire for you!
I don’t really know or understand riots, but is normally caused by a few and then explodes.
How about reading up on some riots?
Also watching some riots might be an idea, so you get a sense of the scale and mob mentality.
Does anyone else have any more ideas?
I think research is the best place to start for you. If you need more help or if I haven’t answered your question don’t hesitate to send another ask.
EDIT: C from writeworld found some extra links!
How to start a Movement- This video is about how to start a movement, it basically says that the first follower is what transforms a lone nut into a leader. It’s really interesting and worth a watch!