From the east or west: Route 30 is probably your best bet.
From the south: Take Route 711 north from the Donegal exit of the Turnpike
From the north: Routes 711 or 271 south (but don't go into Ligonier)
In Ligonier, take Route 711 north (around the bandstand/gazebo in the middle of town) and continue on Route 711 for 2.5 miles to the intersection with Route 271 at the Sheetz store. Bear right onto 271 north for about a mile into the village of Waterford. The festival will be on your right at the Ligonier Township Fire Department's fairgrounds.
Note: The festival is actually in the village of Waterford, not Ligonier. However, there's another Waterford in northern Pa. and we want to avoid confusion. Plus, Ligonier's easier to find.