Your two-hour party will include one hour in the Exploritorium and one hour in the party room. Two-and-a-half hour parties are also available for an additional fee. The Exploritorium may be shared with one other party. Maximum of 32 people per party (this includes all adults and children ages 4 and up). Ask about our private Exploritorium parties that include up to 64 guests.? The birthday child will be mailed a gift after the party.