Retreats are so much fun. I agree about marking things. We have people who complete a couple of quilt tops then we have me. I go for the fun and sometimes get a couple of small projects completed or nearly. We usually have around 30 attending. The lady that owns the retreat always tells us we laugh more than any other groups she has. We take that as a compliment because that is what it is all about to most of us.
Have fun and be sure let us know how it goes for you. Where is the retreat held?