Here ya go. Happened a couple days ago. Patiant came into a hospital and started shooting. It was a gun-free zone but one of the doctors had his gun anyway and killed the guy.
And also there you go. A group of people stood up against a branch of the federal government for something they believe in. No shots were fired, but they were prepared to. The BLM backed off.
Obviously these aren't the only ones. But they should satisfy your criteria.