Garth & Trisha Live! A Holiday Concert Event is tonight, (December 20th)! Garth Brooks and Trisha Yearwood will be making your holidays a little brighter this evening on CBS TV at 8:30pm ET/7:30pm CT (delayed at 8:00pm PT). While they’re both seasoned performers, Trisha shared the outtake and blooper reel from when they were recording the…