I am packing and getting ready to leave on one on Thursday morning. Can't wait. I know I have too many projects packed. Tomorrow I will purge the projects. I'm always "a legend in my own mind" when it comes to getting projects done on retreat. I always take way too many. but, I figure, better too many than not enough. The lists for packing are good ones.
One thing I would add is either painters tape or good old Duck Tape. You never know when you might need it. We tend to hang projects up on the wall as we get them done, or near done. That's where the tape comes in handy. Also for taping down extension cords.
Oneother thing is be sure, if you have them , to bring both of the needles plates. Single hole and the one for other stitches.
Snacks. We all bring them, and some of us take them back home, but you never know when a snack attach will come. If you have a bottle of wine, make sure you have the opener. ;-)
Relax and have fun. It's always a great time.
Remember - What happens at Retreat, stays at Retreat!