Somerville High School junior Megan Barnes marches with others during a Feb. 28 student walkout at the school in Somerville, Mass. A large-scale, coordinated demonstration is planned for Wednesday, March 14, when organizers have called for a 17-minute school walkout nationwide to protest gun violence.
Somerville High School junior Megan Barnes marches with others during a Feb. 28 student walkout at the school in Somerville, Mass. A large-scale, coordinated demonstration is planned for Wednesday, March 14, when organizers have called for a 17-minute school walkout nationwide to protest gun violence. Craig F. Walker The Boston Globe
Somerville High School junior Megan Barnes marches with others during a Feb. 28 student walkout at the school in Somerville, Mass. A large-scale, coordinated demonstration is planned for Wednesday, March 14, when organizers have called for a 17-minute school walkout nationwide to protest gun violence. Craig F. Walker The Boston Globe

What you need to know about the national school walkout

March 12, 2018 12:47 PM