Howard University Hospital Center for Sickle Cell Disease and Faces of Our Children, Inc. will be holding the the Seventh Annual Stomp Out Sickle Cell (SOS) 5K Walk from 9 a.m. to noon Saturday, Sept. 14. The walk will begin at Freedom Plaza and follow along scenic Pennsylvania Avenue and the National Mall. Aaron Gilchrist, Channel 4 News anchor, will serve as the Master of Ceremonies.