There are great advantages to organizing kids parties at home. Less expensive, easier to keep an eye on all the guests, more accessible for the local friends and there's no need to rush everything in a two-hour time frame.
I recommend one adult per age group when visiting an amusement centre
(going with another family can help). Otherwise, older siblings get bored
to tears in the kiddie rides, and young ones have to wait while their older
siblings enjoy big kids rides.