Follow-up:
I participated in the protest gathering last night organized by the DSA. There were hundreds of people (maybe 500-ish?), which is not bad turnout for a protest organized in less than 12 hours. I was late, since it started right around the time I get off work, but there was a nice crowd. Definitely a “big tent” event, with very mainstream-looking folks like myself right next to radical-types. Not a lot of shouting, but good speakers and very serious faces.