Something fun and unique is what's called the Shoe Game. I was so impressed with the laughs it brought that I just had to offer it to everyone and I made it an option for all my customers.
Basically the couple sit with their backs towards each other and they take off both of their shoes and exchange one shoe with each other. I ask a series of questions and the couples raise the shoe to who it applies to. When they disagree only the audience see's the results and laughs.
This event usually only takes about 10 minutes and it's done right before the first dance.
I also offer trivia about the couple at releasing of the tables as an option. I always offer to release the tables as part of my services and if the staff needs any help with moving of tables and chairs.