In the Boy Scouts of America, districts or councils may hold a camporee once or twice a year. Typically, the camporee involves patrol-based competitions, with events such as: hiking preparedness, fire building, knot tying, first aid, emergency preparedness, pioneering, citizenship, patrol mystery event (team building), outdoor cooking, camping or orienteering. Some camporees also integrate work on merit badges. The camporee may be centered on a central theme such as living history, horsemanship, aquatics, shooting sports, a historical trail, a service project, and most recently Geocaching. Camporees often have a campfire program with awards and presentations, skits and songs. Camporees also may have a service project that helps the hosting facility. Typical service projects could be pruning trees, spreading mulch, clearing brush, trail repair, tree planting or trash pick up.