Mark Donnelly, a world-renowned expert in historical combat, will lead a demonstration on the Victorian martial art of Bartitsu at Historic Bethlehem Museums and Sites. Bartitsu incorporated elements of fisticuffs, savate, judo, and jujutsu. The June 20 event will teach attendees self-defense techniques used by literary heroes like Sherlock Holmes. Tickets are $12 to observe or $25 to participate in training, which includes admission to an exhibition on Steampunk art and culture that will intrigue visitors of all ages.