Hartwood Acres presents the Duquesne Tamburitzans in a free performance at 7:30 p.m. Sunday in the Middle Road amphitheater at the park in Hampton Township. The final event in the summer series will be the annual Allegheny County Musical Festival on Sept. 4 with opening bands starting at 5 p.m. and Rusted Root playing at 7:30 p.m. Cost for the festival of $20 per car will benefit the Department of Human Services. Visit www.alleghenycounty.us/parks/hwfac.aspx.