Cornstalk Heights Historical Community Organization (CHHCO) a non-profit organization was started in 1990, when Killiffer Park, one of the communities premier parks, was under threat of being sold with construction of a planned housing project in its place. A community organization was formed to protect and save not only the park, but the surrounding historic home district in Harriman as well. The organization successfully applied to the National Historic Register and became offiicially recognized as Cornstalk Heights Historical Community Organization. The application was partially approved due to the communities uniqueness in being one of the first "planned" communities in the county.
For more than 20 years the community has typically held its premier event, The Christmas Tour of Homes, on the second Saturday and Sunday in December. Participating home owners go to great length to prepare and decorate their homes, usually in the Christmas spirit, for visitors to enjoy. Generally, 8-12 homes participate, along with churches and public buildings. Over the years, additional events have been added and are currently being planned and designed to highlight this wonderful community.