Anniversary Party Decoration Ideas Any 18 Year Anniversary Party Ideas?!

Any 18 year anniversary party ideas?! - anniversary party decoration ideas

Incredible game that I 18 years old. I rented a small ballroom and I like to decorate and make it like a club. I would like to invite many people from my class.
Do you have an idea of what we could add? This can be anything from items, decorations, food, or any other of the box ideas? Thanks
I really want a little surprising, since I to celebrate my birthday always in the middle. For example, when I was 10, my parents raised a surprise party and invited all my class! I was so excited .. xD
I am a man, if it helps. Thank u so much for ideas.