While the pros latter routinely use museum professionals and trained interpreters to help convey the story of history to the public, some museums and historic sites employ living history groups with high standards of authenticity for the same role at special events. Such events do not necessarily include a mock battle but aim at portraying the life, and more importantly the lifestyle, of people of the period. This often includes both military and civilian impressions. Occasionally, storytelling or acting sketches take place to involve or explain the everyday life or military activity to the viewing public. More common are craft and cooking demonstrations, song and leisure activities, and lectures. Combat training or duels can also be encountered even when larger combat demonstrations are not present.