There's a small-ish quilt shop in Watkins Glen, NY (O'Susannah's) that has an apartment upstairs for folks to organize their own retreat with 6 - 10 people. Bedrooms, bathroom, work room, kitchenette - even a laundry for those who want to wash new fabrics before using! There's lots to do in the area in the summer - a great state park with hiking trails, wineries, beautiful lake...
http://www.osusannahsquiltshop.com/q...g-retreats.htm