There are a couple of quilting guilds here in Ohio that do their own retreat-just have to be a member. Check some of the guilds in your areas and see if or when they might have them coming up. If it is something appealing join the guild if need to be a member and go. I think the ones I'm aware of here are usually held in Jan. or Feb.
Here is a link I found but the few I checked looked like it lists facilities and you arrange your own.
http://www.quiltingretreatfinder.com/
Sometimes shops offer in shop retreats-usually just a day but sometimes there will be one that is two days. If it isn't local and it fits your time needed maybe stay at a hotel on your own and spend the days at the shop retreat?