Celebrate Cromwell's rich history at their annual Boomtown Day festival. A century ago, Cromwell was an oil boomtown with more than 10,000 residents. It became overrun by gambling and dance halls and had a reputation for being a rowdy, lawless place. At Boomtown Day, the town celebrates its unique heritage with a parade, art display, quilt show, bounce houses and more. Browse craft and vendor booths, enjoy live entertainment from Native American color guards and enjoy delicious festival food at this one-of-a-kind event.