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): Yes, Decorative balloon sculpture: Yes, Balloon arch: Yes, Balloon centerpieces: Yes. Number of guests: 20-40. Age of guests: Younger than 4, 4-6 years old, 6-10 years old.