On Saturday, March 24th, the students of Stoneman Douglas High School, along with thousands of others, will take to the streets of Washington, DC for "The March for Our Lives." The event has already received sizable donations from heavy hitters like Oprah Winfrey and George Clooney. Celebrities Miley Cyrus, Ariana Grande, Demi Lovato, and Jennifer Hudson now plan to join the march.