The Aldens are preparing for a yard sale when they find an old wooden mask in the trash behind a neighbor's house. Violet notices that the mask looks like a Native American mask that she had read about. When the children go to the library to learn more about the mask, they discover that they have found an old Native American mask from the Hopi tribe. When the children learn there will be an Intertribal Pow-Wow at the park over the weekend, they plan...