After you've enjoyed the initial bliss of newly-engaged life, it's time to start thinking about the engagement party. These days, the first of many pre-wedding celebrations is often an informal event attended by friends and family of the soon-to-be bride and groom. But that doesn't mean that all sense of formality and etiquette go out the window. When it comes to planning an engagement party, you have a lot of choices. Do you want a casual backyard bash, or a more formal restaurant celebration? Do you need to invite all of your friends, or is it okay to keep this guest list small? If you've already started planning this pre-wedding party, these etiquette questions and more have likely already cropped up.