For some of you that don't have retreat centers near you check with churches or schools. There are any number of way to retreat. Most of the churches have kitchen you can use. Each one can bring a blow up bed and the sheets. Set the retreat up for the first of the week when the church is open for use.. I'm sure they have class room's and a kitchen. If you do some quilts for the church maybe they want charge as much since your a non profit.There are any number of ways to do it.
Sometime we do it at a friends house some pend the night other go home to there bed and are back for breakfast the next morning.
Have fun just do it.