Oh, have a wonderful time. A friend and I go to one every March, wouldn't miss it. Bring a variety of things to work on, cut and ready to sew if possible. I usually bring something already in progress, something small, and one more, possibly handwork. Breaks up the monotony if I am getting bored, or if I've made a mistake and need to step away from a project.
I'd also recommend you bring the manual for your machine, just in case. Have also heard that the presser foot and power cord are frequently forgotten.
Have a great time, we'll be looking forward to pictures!