AP Photo/Gerald Herbert A planned, student-led march scheduled for next month is already gaining some deep-pocketed backers. The March for Our Lives, set to take place in major US cities March 24, received $500,000 pledges from George and Amal Clooney and Oprah Winfrey on Tuesday. The march follows last week's deadly mass shooting in Parkland, Florida, where 17 people at Marjory Stoneman Douglas High School were killed. The deadly mass shooting at Marjory Stoneman Douglas High School in Parkland, Florida, that left 17 people dead last week is poised to ignite a nationwide movement against gun violence.