Enter the Haggis and Muddy Ruckus will perform from 5:30 to 8:30 p.m. Friday, Aug. 17, in Castonguay Square in Waterville as part of Waterville Rocks! event, a series of free and family-friendly outdoor concerts.

Along with music, the concert series will offer a beer garden for adults of age. Waterville Rocks! is hosted by the Waterville Opera House and sponsored by local businesses, organizations and patrons of the arts. The series is designed to provide free cultural programming for the community and offer a new way to animate downtown Waterville.

The last concert in the series is set for Sept. 28.

For more information, visit operahouse.org.