"This is what we can do, so I'm here to do it. One of my best friends was killed in gun violence right around here, so it's important to me," said McCartney.
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McCartney was referring to John Lennon, who was shot to death in the archway of his residence in 1980.
The demonstrations drew thousands of people for marches across the country.
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See the signs demonstrators are carrying at March for Our Lives events around the country.none
See the signs demonstrators are carrying at March for Our Lives events around the country.ABCNews
See the signs demonstrators are carrying at March for Our Lives events around the country.none
See the signs demonstrators are carrying at March for Our Lives events around the country.ABCNews
See the signs demonstrators are carrying at March for Our Lives events around the country.none
See the signs demonstrators are carrying at March for Our Lives events around the country.none
See the signs demonstrators are carrying at March for Our Lives events around the country.ABCNews
See the signs demonstrators are carrying at March for Our Lives events around the country.none
See the signs demonstrators are carrying at March for Our Lives events around the country.none
See the signs demonstrators are carrying at March for Our Lives events around the country.none
See the signs demonstrators are carrying at March for Our Lives events around the country.none
See the signs demonstrators are carrying at March for Our Lives events around the country.none
See the signs demonstrators are carrying at March for Our Lives events around the country.none
See the signs demonstrators are carrying at March for Our Lives events around the country.none
See the signs demonstrators are carrying at March for Our Lives events around the country.none
See the signs demonstrators are carrying at March for Our Lives events around the country.none
See the signs demonstrators are carrying at March for Our Lives events around the country.none
See the signs demonstrators are carrying at March for Our Lives events around the country.none
See the signs demonstrators are carrying at March for Our Lives events around the country.ABCNews
Shelby Powell, 15, of Newport High School, holds a sign depicting lives lost in school shootings during the March for Our Lives protest in Cincinnati.AP
Becky Barger from Cornelius N.C. rises her banner in support of gun control in Washington, Saturday, March 24, 2018, on Pennsylvania Avenue near the U.S. Capitol.AP
Sofia Briceno, left, and Josie Dang, from Va.rises her banner in support of gun control in Washington, Saturday, March 24, 2018, on Pennsylvania Avenue near the U.S. Capitol.AP
Students from Great Mills High School of Maryland, protest during the "March for Our Lives" rally in support of gun control in Washington.AP
Crowds of people hold signs on Pennsylvania Avenue before the "March for Our Lives" rally in support of gun control, Saturday, March 24, 2018, in Washington.AP
Eleigha Hamari, 16, right, of Bailey, Colorado rises her banner during the March for Our Lives rally in support of gun control.AP
Students from Great Mills High School Ayanne Johnson holds up the photograph of her classmate Jaelynn Willey during March for Our Lives in Washington.AP
Crowds of people hold signs on Pennsylvania Avenue before the "March for Our Lives" rally in support of gun control, Saturday, March 24, 2018, in Washington.AP
See the signs demonstrators are carrying at March for Our Lives events around the country.none