Yonder Mountain String Band’s Adam Aijala and Ben Kaufmann will play their annual Autumnal Equinox show on September 17. The duo’s performance will take place at Lyons, CO’s Wildflower Pavilion at Planet Bluegrass. Like the past four years, the musicians promise to mix Yonder originals with a variety of Americana and Celtic traditionals (among other covers we suspect). Tickets to the Celebration of the Mabon—as well as a $10 camping option—are now available. Yonder will regroup for a performance at Page, AZ’s Powellapalooza on September 23.