For "1", it's fun and more suitable for elder kids, say age 6 or above. The company will send 3 persons (the party size is around 20) who will guide the gangs to do some experiments, making ice-cream and cotton candy, etc.
For "2", Rachel is the person-in-charge. I saw her show in my kid's school x'mas party. She acted as a disc jockey and introduced games mainly for dancing and singing. The kids loved it so much but if you are looking for other activities, I don't have much comment here.
For "3", Zani is the clown who plays magic, tricks and games same as those other clown's. His price is more reasonable comparing with others.