I have been to only one retreat - and am booked for a second one this summer - I don't want to spend much time on games. Ours was beautifully unorganized - we sew, sew, sewed. We did play Quilt Bingo right before supper one night - it was a change of pace during a sort of dead time anyway. We also went back to the quilt shop that organized the retreat and had a private shopping time after store hours. Had a nice discount, too.
I really liked the one where you called out Bingo things as you sewed - used a ripper, etc. That would add fun without taking sewing time.