The March for Our Lives was an early 21st century demonstration organized by students in support of gun control legislation in the United States of America. The event took place in Washington, DC.
In 2259, the demonstrators were seen on an avenue leading to the United States Capitol in videos about Earth's history presented by Captain Christopher Pike to the people of Kiley 279. (SNW: "Strange New Worlds")
The banner identifying this event can be seen in front of the US Capitol.
The video seen in the episode shows the demonstrators near the intersection of 7th Street NW and Pennsylvania Avenue NW.