Late on a rainy afternoon last week, Cameron Kasky and Zion Kelly, gun-reform activists, were in the lobby of the Hotel Beacon, on the Upper West Side, wearing tuxedos. Kasky is a survivor of the mass shooting, in February, at Marjory Stoneman Douglas High School, in Parkland, Florida. He was memorably self-assured when, on CNN, he pressed Senator Marco Rubio about accepting N.R.A. funding; he went on to help organize the March for Our Lives. At that protest, Kelly, a high-school senior from Northeast Washington, D.C., spoke about the death of Zaire, his twin brother, who was shot and killed during an attempted robbery. Kasky and Kelly were waiting for Samantha Fuentes, another Parkland student, to join them; they would then drive to the American Museum of Natural History, each…
