Event type: Birthday party. Indoors or outdoors: Indoors. Balloon art type: Simple balloon twisting (e.g. 1-balloon dog): Yes, Detailed balloon art (uses several balloons): No, Decorative balloon sculpture: No, Balloon arch: No, Balloon centerpieces: No. Number of guests: 20-40. Age of guests: Younger than 4, 6-10 years old, 18 and older.