A walkout is planned on April 20, which will mark the 19th year since the Columbine High School massacre in Colorado that left 13 dead.
More than 22,000 people have signed a petition, pledging to walkout of their classrooms that day at 10 a.m. for the rest of the day.
“Nothing has changed since Columbine, let us start a movement that lets the government know the time for change is now,” organizers wrote in the change.org event.

