One can learn so much from the other participants...and not just quilting and sewing tips. :0)
The key is to not take everything you own on a retreat. Pack your equipment in terms of projects. I usually take two pre-cut projects (in case I have an issue with one). My sister-in-law includes a hand-sewing project with her two quilt project. I have my two projects kitted up in project boxes. I take a notions box, small cutting mat with cutter, a light, an extension cord, my machine, a comfy chair, a wooden TV folding tray (remember those?) and pencil and note paper. My kits, notions, mat, light, cord, pencil and paper fit in a Thirty-one utility tote. I use a rolling tote for my machine. It's super easy to load and unload.