Wow! Sounds like a great party!
How about some 80s themed props people can use in the photo booth.
Walmart has some pretty journals you could use as the guestbook. You could also ask people to write a favorite story, or a sweet 16 message in addition to signing.
You could add 80s themed stickers or clip art to the namecards.
Happy sweet 16 to your daughter. She has an awesome mom for putting this together.