Yonder Mountain String Band, Hot Buttered Rum, Cornmeal, Split Lip Rayfield and Dirtfoot are among the acts confirmed to appear at Grassy, MO’s River Romp 2012. The festival will take place at Arrowhead Campgrounds from June 28-30. Other acts slated to appear include: The Ben Miller Band, Tyrannosaurus Chicken, Carrie Nation & The Speakeasy, The Big Idea and The Whistle Pigs. Many additional acts will join the festival’s lineup in the coming weeks.