MERRIMAC — A hip hop workshop and a Woodstock tribute concert will be offered at Merrimac Public Library, 86 W. Main St.

The free workshop, “Urban Moves”, is Thursday from 6 to 7 p.m. for ages 5 to 13. An instructor from Boston Mobile Dance will teach some basic hip hop moves.

Registration is not required. The workshop is funded by a grant from the Merrimac Cultural Council.

The Woodstock tribute concert is Aug. 8 at 7 p.m. To commemorate the 50th anniversary of Woodstock, the band Yoke Shire will play authentic renditions of music performed at the original festival in 1969.

Band members and brothers Craig and Brian Herlihy will share historical details and stories about the festival as well as information on the artists and songs they chose to perform at the concert.

The band will be joined by Merrimac resident Bill Hanley, who designed, built and operated the concert sound system at Woodstock and even helped select the farm where it was held.

Hanley is known worldwide as the “Father of Festival Sound” and will participate in a short question-and-answer session during the concert. He was the focus of a 2014 documentary and book, “The Last Seat in the House” by John Kane.

Check out the band at www.YokeShire.com and the documentary at http://www.thelastseatinthehouse.com/.