Actually, we probably should move this thread over to the Demo forum so as not to give away any demo "secrets" ;-) Actually, it's not a big secret anyway. If you've ever been to a workshop you have probably played this game.
What you do is you decide on a list of prizes - usually anything in the catalog under $5 or so and then maybe one or two bigger prizes like stamp sets or free admission to a stamp camp or something. Then you seal each one of them into an envelope, or a bag, or something that looks very tempting to open. Then at a workshop, you place the envelope or bag in front of each guest and announce that there IS a prize in there and if they want to find out what it is, they neeed to book a workshop with you. My twist on it is that if 3 guests book workshops then the hostess gets to open her envelope. It just generates some excitement and a little peer pressure to get bookings.
Just to keep you safe from flakers and cancellations, they don't get the prize until they hold their workshop. Then I usually give the prize as the hostess gift. That way, it gives you a reason to mention the game.
I have my Book to Look envelopes decorated to match my door prize bags and cello toppers - they just have an incentive stamp and a black spot inside (mini ink pad). If you'd like to take a peek, here is the link to my gallery:
agentil's Gallery at Splitcoaststampers
Look to Book Bag
