I go to about 4 retreats a year. I always make a list of projects and everything I need to finish that project. then I mark them off as I pack them. I always bring a kindle or a CD player and earphones incase I want to just tune everyone out for awhile because it can get noisy. Make sure you have a notebook along so you can mark down what you wish you would have brought for next time. Once you have been to one make a list and check things off as you pack them. Remember specialty rulers, thread, patterns, and all machine supplies. (feet, cord, etc.) Have fun and relax usually if you forget something someone can help you out.. I always bring my own chair but that is just me.