I'm interested depending on the place and date. I have a DD who lives near Chicago, so I have visited a few shops there. quiltfabric.com has interesting classes and retreats. they are in Willowbrook.
just FYI--The Princeton shop- the Quilter's Garden- does have retreats. They are of a few who are sponsoring an Alaskan cruise in August for quilters. Peddler's Way may have retreats, I'm not sure. They have sew-ins on a regular basis I believe. Cozy Corner in Metamora did have a retreat center in the past and it has since been sold to a private individual. The Fabric Center in Morris has some interesting classes and sometimes has national people to teach. D's Sewing Center in Peru has interesting classes. I mentions these incase you are not familiar with these shops. Any may be able to provide information needed for a retreat. Update, the quilt shop in Ottawa has closed.