The Panthers did free before school breakfast and after school babysitting and all sorts of actual community building like that. The PSL does protests and craft events and that’s it. I guess providing consistent services is an order of magnitude more difficult than organizing marches but it just doesn’t seem like the marches are getting us anywhere.
Oddly enough I’ve seen a lot of announcements on Instagram. “Upcoming events” posted by a leftist bookstore or church nearby may also be helpful - yesterday I found out this way that apparently there is a Chicago chapter of Extinction Rebellion. But word of mouth is the best way, a lot of orgs just don’t have good social media or get squashed by the algorithm.