T.H.
Okay, well here are some fun ones I've done that usually get some laughs.
Left/Right game...You can find this game if you google it, there a few different ones out there, but they are stories that use the words the right and left a lot. Have a gift for the bride to be or a party favor and everyone has to pass it around left or right according to which direction the story says. Whoever has it at the end wins the prize. (or gives it to the bride and gets a different prize)
Husband-to-be Favorites...This will require someone to talk to the groom and ask him a bunch of personal questions. Things like what was your first pet's name, what is your favorite color, what hospital were you born in, what were you wearing on your first date, etc. Then you have to ask the bride these questions and for everyone she gets wrong she has to put a gumball (or a marshmallow) in her mouth. She can't eat them, she just has to store them.
One I made up for a baby shower once was sort of a trivia game. I googled a bunch of answers to random questions like how many diapers are consumed each year, etc. You could do the same for weddings. Just think of a bunch of questions and find the answers, then have people guess and whoever has the most right answers wins a prize. It's fun and informative! ;) Good questions would be like how many women get married in the US every year, what is the average cost of wedding dresses, what is the average amount of bridesmaids per wedding, what is the most popular honeymoon destination. Some answers may be hard to find so you may have to change your question or make up some others!