(NBC News) Teenagers from across the country are gathering in the nation's capitol for Saturday's "March For Our Lives".
The march is part of an ongoing grass roots movement started by students from Parkland, Florida after a gunman killed 17 people during an attack on Marjory Stoneman Douglas High School.
They're calling on lawmakers to change gun laws as part of their promise to help keep schools safe.
Nearly half a million are expected to march through Washington.
More than 800 more marches are scheduled across the country on Saturday.
"It's not just about Stoneman Douglas. It's about every school, every movie theater, every park, every community," says Boston organizer Leslie Chiu.
Read more here.
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