During potions class we also had kids make a fizzy potion in small cauldrons that were purchased at Target. House scarf material was purchased at JoAnn fabrics with a 40% off coupon and the robes were cut from black trash bags. House assignments were cardstock printouts of the 4 houses placed on necklaces. Don't forget to play the Harry Potter theme music as the kids come in. The kids really loved this party!