Sioux Falls, SD (KELO-AM) - Thousands are attending the largest free Christian music festival in the country. It's taking place south of Sioux Falls. The 17th annual LIFELIGHT festival kicked off Friday night in Worthing, South Dakota and wraps up tonight. The event started in a church yard on the west side of Sioux Falls, and has outgrown several other venues. Officials with the event say they plan to stay with the Worthing farm site for years to come. Founder Alan Greene addresses the crowd at 8:30 tonight, and the final concert starts at 9:30, as Matthew West takes the main stage.