I plan on picking the cards from a cauldron and then using a witch's finger to count and point to the rhythms. The witch's finger is just a fake witch finger you can find at a party store or Halloween store.
Witch’s Brew: Players draw cards and perform the rhythm on each card. When the Witch Card is drawn they get a little prize: sticker, candy, Halloween treat.
You can keep adding on to the cards you have drawn, making an extended rhythm.
You can clap the cards, perform them on a rhythm instrument or piano.
Another idea is to use some Halloween words to say the rhythm. For example, a triplet could be "Halloween" and eighth notes could be "Pumpkin" or "Mummy". I have more ideas in the directions on page four.