What is the best way to describe a group of people who peacefully assemble to voice concerns?

The term that best describes a group of people who peacefully assemble to voice concerns is "peaceful demonstration." This phrase specifically denotes an organized gathering where individuals express their opinions on particular issues without resorting to violence or aggressive actions. It captures the essence of civic engagement, where participants seek to articulate their views, advocate for change, or bring awareness to specific issues in a non-confrontational manner.

Other options diverge from this definition. A political rally typically suggests a more organized event aimed at garnering support for a political candidate or cause, which may not inherently focus on voicing concerns in a peaceful manner. Violent political unrest clearly indicates disorder and conflict, which contrasts starkly with the idea of peaceful assembly. An executive protest usually refers to protests led or initiated by company executives or organizational leaders, and it may not emphasize the collective voice of citizens peacefully advocating for their rights or concerns. Thus, "peaceful demonstration" is the most accurate and encompassing description of the scenario presented.