When each person arrives at the gathering give them a penny and tell them to hold on to it for a game later in the evening. When you're finished with the demo and everyone is about to order tell them about the penny. They have a few options. They can keep the penny as your gift to them. Or they can redeem their penny and save .01 on their order. Or they can give you the penny to "buy" a prize. Tell them ahead of time what the slips say so they can decide if they want to take a chance. If they decide to "buy" a prize, they must draw a slip from your mystery bag! Inside the bag have slips of paper with: 10% off your order, $2.00 off your order, free shipping, no tax, choose a gift.  They get to reach in the bag and draw a slip. If they are really lucky, they get to book a party ! They must choose a date that night so have your calendar handy. I've booked lots of demo's from this. Everyone likes to try their luck and it's a "pressure on them" way to get bookings!! Be sure to mark your slips as to not give away to many expensive items, shipping, etc.