Gazzo's Tossed Out Deck is a must. It's just amazing. And the DVD is coming in a few weeks. One of the best tricks for crowds of people ever.
Actually this effect isnt the best for the type of situation he is performing in; Unless its a parlor or stage show (i.e. Talent show), even large busking groups. This effect isnt ment to be performed close up and with a small crowd- like school out side or at lunch (unless you perform for the whole cafeteria or a real large group... which I doubt is the situation). You'd really be risking being caught.
Its Tossed around for a reason... not handed around.
Now what you can do instead is a simplier version where you simply force 3 different cards and reveal them to the people.
Be creative, come up with some of your own stuff. Get Royal Road, Card College or the one of the Apocolypse books. Figure out ways to include more people. Even if its as simple as holding the cards or one guy picking and another signing.
Montes can also be mutli-person effects. But again, those might not go over well in school.Sponge Balls is one of your best bets.
Pick up Sponge with Jay No..[I cant spell the rest of his name].