National History Day is more than an academic exercise for thousands of Oklahoma junior high and high school students; it is a tradition. On May 1–2, more than 500 students in grades 6 through 12 will present their exhibits, documentaries, performances, websites, and papers at the Oklahoma History Center in Oklahoma City for the opportunity to advance to the National History Day contest. Due to the size of the event, there will be gallery closures on these days. Galleries and…