sentences:  The Boone County Courthouse, built in 1909, and the Boone County Jail, built in 1914, were both designed by architect Charles L. Thompson and are listed on the U.S. National Register of Historic Places.Harrison hosts the annual Arkansas Hot Air Balloon races each September, Crawdad Days Music Festival each May, a Harvest Homecoming festival each October, and Christmas celebration in December.The National Trust for Historic Preservation has recognized the Harrison Courthouse Square Historic District.