Congratulations! I hope you love it as much as I did when I was able to go. They do have a dress code now, but even if they didn't, I like to make is a special experience. I suggest dressing up slightly, but nothing sleeveless as they won't let you in! I have done slacks and tunic or a nice skirt. Slacks and a nice shirt for DH. It's a nice meal with very attentive service. The menu changes seasonally, but they typically have a little of everything, meat, fish, poultry, pasta. Feel free to go out on the veranda, it's a great view, just be sure to close the door after you if it was already closed and you aren't sitting next to it. I took pictures of everything our server gladly took a picture of my group. They do sell Club 33 gifts, these change, but I've seen shirts, mugs, shot glasses, key chains, Mickey ears, pens, pins, etc. They are in a cabinet near the elevator. You have to ask to see them and the price, but don't hesitate to ask. They do not let you in early so don't show up any more than 5 minutes before your scheduled time. Then you ring the bell, they ask for your name, and if it's not too early they will let you in. If you're early or there are already a number of groups waiting they will have you wait outside.
Enjoy!!