 15, BPO Elks.An audience of 5,000 people watched "The War in song" by Silas Gamaliel Pratt, a military and musical allegory of the Civil War sung by a chorus of 500 voices.The Convention Hall was used extensively for various activities including a movie theater for silent movies, religious conventions, a roller skate rink, food shows, the Washington Auto Show  and dog shows organized by the Washington Kennel Club.