The Rock ‘n’ Roll Seattle Marathon and Half-Marathon, part of the 60th annual Seafair festivities, will conclude with a post-race concert by Keb’ Mo’ in King County’s Marymoor Park, at 8 p.m. Saturday, June 27.

Volunteers are needed to assist at the marathon, with duties such as set-up, pre-registration, manning water and medical stations and more. Volunteers will get a free Race Crew t-shirt, a free ticket to the post-race headliner concert, a goodie bag and the satisfaction of helping others.

During the Rock ‘n’ Roll Seattle event, live bands and cheer squads will line the route to encourage runners and walkers, with music ranging from alternative to classic rock, punk, funk and blues.

Among scheduled performers is the Kirkland-based band Shotty, past winners of the Classic Rockathon at Redmond’s Old Fire House Teen Center.

For more information about Seafair events, visit www.seafair.com.