Whether you choose the Mad Mixtures Show, the Indoor Fireworks & Lightening Show, the Chemiluminescence Show . . or one of the other handful of birthday shows offered by Mad Science . . you are sure to spark the imagination and curiosity of your child while giving them the best birthday party ever! Your gift includes Mad Science party invitations, a giant Mad Science poster for the birthday child and your choice of birthday program for up to 20 children. No expiration dates apply. Parties take place at specific time slots on Saturdays and Sundays only.