An evening of live music from “Les Miserables” has been scheduled for Sunday, Nov. 7, as a benefit to support the introduction of the Challenge Days program to Falls Church’s Mary Ellen Henderson Middle School, it was announced this week. Challenge Days is a premiere national program that helps students work through their fears and hatred of differences, addressing directly the kind of bullying and taunting that led to the nationwide spate of high-profile student suicides that accompanied the start of this school year.