One of the participants, Ben Sullivan, 28, expressed distress at his Jewish identity being exploited for harm, stating: "It makes me really upset, but it gives me a lot of hope to see so many other Jewish people who feel the same way."
Palestinian-American activist Linda Sarsour and American actor Wallace Shawn also attended the event.
Israel resumed its military offensive against the Gaza Strip on Dec. 1 after the end of a weeklong humanitarian pause with the Palestinian group, Hamas.