On Saturday, hundreds of thousands of people across the United States, and even some members of the international community, participated in the March for Our Lives, hoping to raise awareness of gun violence in America and demand changes and upgrades to existing gun laws by Congress and representatives at state levels.

The event was initially orchestrated by the survivors of the shooting at Marjory Stoneman Douglas High School in Parkland, Florida, but has since become a full-fledged phenomenon around the nation. Several celebrities were among those who chipped in their time and resources to show their support for the kids' movement. For some stars, that meant donating money to the organizers in advance, while others like Andra Day, Common, Demi Lovato and Ariana Grande arrived as special guest performers for the Washington, D.C. sector of the march.

For a lot of A-listers, though, supporting the cause meant putting boots on the ground for the various marches taking place across the country.

Adam Scott reunited with some old Parks and Recreation pals — including Aubrey Plaza, Paul Rudd, Natalie Morales, and Billy Eichner — for the D.C. march.

And even though he wasn't on-hand for the main event, co-star Nick Offerman joined in from Los Angeles, fit with a Leslie Knope-themed T-shirt, to wit.

Also in the capitol city was the Kardashian-West family. Keeping Up with the Kardashians star Kim Kardashian-West shared an image of her husband, Kanye West, and four-year-old daughter North West, marching together in Washington.

Disney Channel show alums-turned-pop stars Miley Cyrus and Demi Lovato joined forces for the D.C. event, at which Lovato delivered a touching performance of her song "Skyscraper."

Scandal star Tony Goldwyn joined in from New York.

Grandfathered stars John Stamos and Josh Peck also hailed from California in their own unique way.

#Repost @shuapeck #marchforourlives

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9-1-1's Connie Britton and Big Little Lies' Laura Dern were involved as well.

Meanwhile, others pitched in in their own ways, like Jimmy Fallon co-sponsoring a bus full of NYC marchers.

Grown-ish star Yara Shahidi even wrote a poem on gun violence and racial issues in America.