Spawn an NPC riot.
NOTE: There are some quirks here between NPCs and OneSync. I've tried to alleviate as much of the weirdness as possible but be aware there can be some small things that could happen. For instance, if you start a riot and you leave the area and you get more than 1500 feet away from any of the rioters, sometimes despite much effort to keep it all together, your client might lose track of a rioter or two and if you stop the riot they will be orphaned and left until someone kills them. I have not seen it often but it can happen. Also, NPCs are extrememly unpredictable. Setting them loose in a rioting state of mine can have crazy things happen and is very brutal. They sometimes WILL attack each other or you, even if you are set as friend. Just be warned that it's like trying to control a wild animal that doesn't want to be controlled... sometimes the animal acts up a little.