Take exit 35 (Lunenburg/Lancaster) and go south on SR 70 toward Lancaster. When you reach SR 117, you will turn left, then immediately right on the continuation of SR 70.
Continue approximately 1/2 mile, passing the Lancaster town common on the left, to a fork in the road. You will take the right fork continuing on SR 70 (Main Street.)
Thayer Performing Arts Center is on the right side of the road 0.3 miles from the fork. You will cross the Nashua River, pass a field on the right, and see an old cemetery on the left. Thayer is right around the corner on the right. It is a large yellow building set back from the road.