Protesters marched in cities across the country Thursday calling on lawmakers to pass gun control measures in the wake of a series of mass shootings.
More than 400 rallies were planned in the US on Saturday, less than three weeks after a massacre at a Texas school.
March for Our Lives, a group formed after the mass shooting at a high school in Florida, organized most of the events.
Garnell Whitfield Jr., whose mother died in a racially motivated shooting at a grocery store in New York, was one of the speakers at the D.C. rally.
According to the Washington Post, the crowd at the D.C. event appeared in the low thousands despite the rain.
Up to 2.2 million people took part in more than 750 events during the initial March for Our Lives protests.
The Democratic-controlled House passed a package of gun control measures that included banning high-capacity magazines and raising the minimum age to buy semi-automatic rifles to 21, but Republicans in the Senate are likely to block the bill.