expropriate some land
This happened vaguely during blm with a police station. Mobilize the homeless and convince them they can stay in a police station, which would benefit somehow or something... not sure.
A handful of homeless/very poor come out during protests already about housing rights or to increase welfare. At least 1 homeless guy i met goes out to every antimask protest. A lot of them go out to church services on sunday, even the church services that are not in a shelter.
Or if a riot has like the promise of seizing a target again, that's something. But i wouldnt recommend a riot.
Unfortunately, from what i've seen, if the venue being seized has a lot of cigarettes, that would also maybe convince some homeless