Three rocking mostly string bands will get people dancing Sunday when two island groups, RISK and RISK Jr., open for the Seattle fiddle-driven trio, The Onlies. This is a benefit performance for the RISK scholarship fund, which supports music lessons and instrument rentals for low-income children.

Playing original and traditional fiddling tunes with Celtic, old-time American and Canadian roots, The Onlies have performed throughout the Pacific Northwest. Members of the band sing and play fiddle, guitar, mandolin, banjo and piano.

The Onlies just recorded their first  full-length album, “Setting Out to Sea,” a fine feather in the caps of the three Garfield High School musicians — Samantha Braman, Riley Calcagno and Leo Shannon — who have played together since they were 2 years old.

Island bands RISK ­— the Rock Island String Kollective — and RISK Jr. will set the lively tone for the evening with their opening sets. With violin, viola, cello, guitar, ukulele, mandolin, banjo and harp, RISK brings a new flavor to Irish music, Klezmer, the Beatles, Red Hot Chili Peppers and more.

RISK Jr. — Rock Island String Kids — is for any child in the third- through fifth- grade who wants to learn how to play a stringed instrument. Kim Thal and Sarah Perlman teach the fundamentals of music in a group setting using a wide range of musical styles. These are low-cost classes available to any child, regardless of ability to pay.

More than 25 Vashon children and adults will take the stage followed by The Onlies’ concert and dance. Larry Muir will call the dance portion of the event.

The concert and dance will begin at 2 p.m. Sunday at the Open Space for Arts & Community. Tickets are $10 for individuals and $15 for families with children. For more information and to purchase tickets, visit www.openspacevashon.com or www.brownpapertickets.com.