Knowlton Riverfest. The Australian band Brother and the popular Railroad Earth are among the acts from around the world as Riverfest celebrates its 10th anniversary with a long weekend of free music. Other acts include the Afro-Cuban super group Yerba Buena, Peter Karp, Subcommittee, Adrienne Young & Little Sadie, Black Widow, Kruger Brothers, Richard Bona, Still River Band and Irene Ferrara. New this year is the Hackettstown Community Hospital Acoustic Tent on Saturday afternoon, featuring acoustic sets between performances on the main stage by musicians including Jack Tannehill, Mef Gannon, Kathy Moser, Jody Price, Paul Gargiulo and Heidi Muller. Also, the Brown & Brown Insurance Kids' Tent on Sunday, hosted by Big Brothers/Big Sisters of Warren County, will offer numerous activities for young children, an opportunity to meet Lovely Lucy the clown, and a chance for the kids to win great prizes throughout the day. Throughout the weekend, concert-goers can also enjoy a stroll through the Vendor Village, dine on an assortment of affordable foods and beverages or take a short hike down to the Delaware River.