Buy “Thank you” cards for the bride to use after the bridal shower. Set up a small table or area where you can place the stack of “stamped” envelopes from the cards. Supply some pens and a large bowl or bucket as well. As guests arrive have them put their name and address on one of the postage paid envelopes and place it in the bowl.
During the event (or at the end) have the bride mix up all the envelopes in the bowl and pull a winner for a prize.
After the party present the bride with the thank you cards and stamped, addressed envelopes. This is a great way to have a door prize contest that also give the bride a gift that is much more appreciated than you would think.
Note: You can place stamps on the envelopes after the raffle in case a guest messes up while writing you won’t lose the stamp. Just make sure to place the stamps on the envelopes before presenting them to the bride as a gift.