Thousands of students are expected to participate in the March For Our Lives in Washington, D.C. on Saturday, calling for action to stop gun violence after a spate of deadly school shootings. In the weeks since 17 people were killed by a gunman at Marjory Stoneman Douglas High School, students around the country — following the lead of students in Parkland, Florida — have walked out of their classrooms to protest gun violence, lobbied law makers to pass gun reform legislation, and planned Saturday’s mass demonstration. As students gathered in Washington, D.C.