As the longest evenings of the year are upon us, delight in live bluegrass music along Clenny Run Bank. Bring a picnic and lawn chairs or blankets, and enjoy some of our finest regional musicians.One Friday evening every month. Museum Store and Cottage Café will be open for light fare, wine, beer and other beverages. Members Free. Included with admission Enjoy live bluegrass music along Wintertthur's Clenny Run Bank. Bring a picnic and lawn chairs or blankets, and enjoy some of our finest regional musicians.One Friday evening every month.