YARMOUTH  — Singer-songwriter Aoife O’Donovan, a founding member of the Boston-based newgrass sensations Crooked Still, will headline the eighth annual outdoor Henryfest on Sunday, Sept. 9, at Skyline Farm.

Also performing at the event featuring music and family fun will be the Stray Birds, This Way, Cumberland Crossing, The Lay-Z-Gait Band and 317 Main Community Music Center student ensembles.

Festival activities include a children’s area with face-painting, music-making, a book corner and a dress-up area. There will also be a pie table with myriad home-baked pies sold by the slice. Local food vendors will include Mr. Sippy’s BBQ, Otto Pizza, Taco Trio, Toots Ice Cream, Kids Gone Raw and Allagash Brewing.

Proceeds will benefit 317 Main Community Music Center.

O’Donovan,  a member of the folk-noir trio Sometymes Why, grew up in a musical family, immersed in folk music. She studied contemporary improvisation at the New England Conservatory of Music in her hometown of Boston.

Most recently, she recorded and performed with Yo-Yo Ma, Edgar Meyer, Stuart Duncan and Chris Thile as a guest vocalist on The Goat Rodeo Sessions. She has maintained a variety of side projects and collaborations, working with numerous other artists, including Ollabelle, Karan Casey and Seamus Egan.

The Stray Birds draw upon the richness of American folk music traditions with  songwriting that features three-part harmony. The trio plays fiddle, guitar, mandolin, banjo and upright bass. Making up the group raised on music in the farmland of Lancaster, Pa., are Maya de Vitry, Oliver Craven and Charles Muench.

This Way is an alternative country band based in Portland. Andrew Martelle, a 317 Main instructor, plays fiddle and mandolin with the band known for its vocal harmonies, foot-stomping rhythm and down-home grit. This Way was nominated for Best Roots/Americana/Folk Act and Best Maine Act of the Year by the 2012 New England Music Awards. The band is scheduled to release a new CD in September.

Cumberland Crossing is a bluegrass band featuring some of the top pickers from southern Maine. The Lay-Z-Gait Band plays western swing and features 317 instructors Tom Whitehead on guitar and Andy Happel on fiddle. Two 317 student ensembles made up largely of teenagers will perform music ranging from traditional bluegrass to acoustic arrangements of their favorite contemporary rock songs.

Henryfest will run from noon to 7 p.m. Skyline Farm is at 95 The Lane. For advance tickets, $18 individual/$35 family, stop by the front desk at 317 Main St. or call 846-9559. Tickets at the gate will be $20 individual/$40 family. Parking is free. If its rains, an alternate indoor site will be announced on 317’s website, www.317mainst.org.