https://en.wikipedia.org/wiki/2018_United_States_gun_violence_protests

Ongoing protests.
Does anyone really believe a bunch of high school students independently staged this "lie-in" in front of the White House in Washington DC?

Someone else, likely on the Left, organized these kids to do something they could never imagine doing on their own. The gun control agenda has been ongoing for decades, and this is just exploiting it. In the words of Rahm Emmanuel, "You never want a serious crisis to go to waste."