There’s no evidence that people celebrating “No Kings Day” (whether you mean the historical anti-monarchy sentiment tied to early America, or a modern protest slogan) were calling for murder. Sometimes people try to rewrite or exaggerate protests to make them seem violent when they weren’t.
If someone is trying to equate opposition to monarchy—or criticism of Trump’s king-like behavior—with calls for violence, that’s just false. Rejecting authoritarianism is not the same as advocating harm. This is for all the ones says "No Kings Day" was a call for violence