1. More than 800 demonstrations against gun violence are planned on Saturday in the U.S. and around the world.

The campaign, called the March for Our Lives, is being led by students and will include survivors of the Parkland, Fla., shooting and other attacks. This map shows where they will be held, and we’ll have live coverage starting Saturday morning. Above right, David Hogg, a student activist from Parkland, visited a school in Washington.

Our video journalists profiled a 15-year-old who lost his brother to gun violence in Chicago. Now he’s getting ready to march in Washington.