I did the same to my wife on her 50th. There is a restaurant where we often go to eat. We know the owner well. I rented the banquet room next to the dining room and all the friends and relatives and her co-workers at Borgata Casino came. They were hiding in the banquet room. We faked her out by telling her I was taking her out to dinner there with two of her friends. I set it up with the owner that we would sit at a table next to the banquet room which had doors leading into it. We set it up that the table in the restaurant needed one more chair for the 4 of to sit down and the owner who was standing at our table said she'd get another chair out of the banquet room which was dark. As the owner stepped over to open the door to the room, I said "Honey, those chairs are heavy, could you go help her?" When she stepped into the room, they turned on the lights and shouted "Surprise". There were about 100 people there and it was really a shock to her. I loved every second of it!!! Frankie