In October of 2013 the MainStreet Warner Stage opened in the beautiful amphitheater behind the bookstore. An amazing band of carpenters, led by Peter Ladd, Robert Shoemaker and Charles Betz, modeled the stage on a 13th century post-and-beam barn design, and built it with the generous help of local carpenters and volunteers and funds raised from the community.  The amphitheater and park is irrigated by a stored rainwater system installed by Greenleaf Irrigation and the solar array was installed by Harmony Energy Works.

For over a decade now, the stage has been the venue for MainStreet Warner's Summer Concert Series, featuring locally renowned bands and musicians playing in an enticing array of styles, including rock and roll, rhythm and blues, folk, pop, bluegrass, and country. The MainStreet Warner Stage also serves as the Main Stage for entertainment and park festivities during the Warner Fall Foliage Festival every October.