Rascal Flatts will try to make the holidays a little brighter for kids at Nashville's Monroe Carell Jr. Children's Hospital at Vanderbilt. The trio will be at the medical facility Thursday for the annual tree lighting ceremony, during which they'll flip the switch to illuminate the holiday trees decking the hospital's "Main Street." During their visit Joe Don Rooney, Jay DeMarcus, and Gary LeVox will also meet with patients and their families as well as the hospital's staff. Rascal Flatts will also hand out tickets to their upcoming appearance at the Grand Ole Opry. The group's Opry performance Friday night will mark their final concert of the year.Rascal Flatts has been dedicated to supporting Monroe Carell Jr. Children's Hospital at Vanderbilt. Over the years the trio has raised more than three-million-dollars for the facility.