Watch HDToday. Ring in 2021 tonight with The Avett Brothers! Their 17th annual New Year’s Eve Celebration features a full band performance, special guests, and a countdown to 2021 with Scott and Seth Avett. Tonight’s stacked lineup of guests includes Willie Nelson, Brandi Carlile, Norah Jones, Judd Apatow, G. Love, Langhorne Slim, Asleep at the Wheel, and many more! Dax Shepard will be serving as Master of Ceremonies.