tour dates for her upcoming performance schedule with singer-songwriter Billie Eilish. Smith — who musically goes by the mononym Willow — will be performing with Eilish beginning at next month’s Life Is Beautiful festival in Las Vegas, Nevada on Sept. 17.The pair will again team up in early 2022, when Willow, 20, will join Eilish, 19, on a tour that begins in New Orleans on Feb.