Happy Birthday. I like to take projects to retreat that are reasonable easy. Things that I won't have to study the directions. I usually spend time talking and visiting so don't want anything too difficult. Some retreats have classes and presentations, some don't. Unless there are vendors there or a LQS close by make sure you bring everything you need. I usually bring a surge strip with multiple plugs on it. I make up my own kits at home and do all of the major cutting before I get there. I bring a small cutting mat and ironing mat and iron. If you forget a ruler or something, someone will have one you can borrow. Our retreat has a snack table to share. Have fun.