On Wednesday, thousands of students marched out of class to protest the country’s inaction on gun control, marking one month since the Parkland, Fla., shooting that left 17 people dead.

The event, summarized by the hashtag “National Walkout Day,” attracted big-name speakers like House Minority Leader Nancy Pelosi, D-Calif., Senate Minority Leader Chuck Schumer, D-N.Y., and Sen. Bernie Sanders, I-Vt.