Dallas ? About 500 people crowded Saturday into the plaza where John F. Kennedy was shot 45 years ago, all agreeing it was right to remember a pivotal moment in American history, even if they didn’t all believe the official line.

People stood shoulder to shoulder and bowed their heads during a moment of silence at 12:30 p.m. Some hawked JFK memorabilia or pitched conspiracy theories to visitors. Others offered firsthand accounts of their memories of the killing.

Street vendors held out commemorative newspapers hoping would-be customers would buy them. One person roamed the crowd with a sign questioning whether it was a lone gunman who killed Kennedy or several.

A group of men who wore black suits, matching ties and earpieces stood silent and appeared to guard a large black banner behind them.

On Saturday, two Xs spray-painted in the street marked the spots where Kennedy was hit as his motorcade drove through the plaza. A placard from the National Park Service stood on the ground directly across from one X.