Yes! Please do that! It makes thinks much easier for us. If you aren't going, please also let us know.
If your envelope says [your name] & guest, then feel free to bring whomever you'd like.
Yes! Please be wise about it though. We want to remember this night!
No, but it does make things a lot easier for us. The wedding is in Las Vegas and we live in Utah, so taking gifts home may be a challenge.