Scheduling conflicts have forced Jill Biden to cancel her trip to Louisville today. She was scheduled to make an appearance at the first-ever “USO Home front Concert” tonight at the KFC Yum Center.The free concert is for military families and the volunteers who support them. It's a joint effort of the USO and the Kentucky National Guard. The event marks the first USO concert created especially for military families.The anticipated audience includes 32 million homes in the U.S. and over 378 bases worldwide.The concert is scheduled to begin at 7 p.m.