Stephen Lemons has been covering the disputes over who caused a spate of violence at the immigration march on Saturday. A mounted police officer got involved with a crowd of self-styled anarchists who had attached themselves to the march. The cop ended up hitting the crowd with pepper spray, with predictable results. Lemons has been looking at video of what happened, noting along the way that he hadn’t seen anything that backed up the anarchists’ contention of being aggressively attacked by cops. In fact, today he notes some photos that seems to show a black-clad protestor hitting a cop’s horse.

… As part of the Scottsdale Museum of Contemporary Arts’s ongoing Rewind Remix Replay exhibition, which explores the design of electronic musical instruments and sound systems, there’s a DJ night at the museum Thursday, Jan. 21. Featured: Mark Chan and World Famous Rani “G.” It starts at 7 p.m. and its free. Details here.