Good planning is the secret of a successful party.
Send out your invitations 2 weeks before and put a date for your RSVP - people are more likely to reply. There are a variety of entertainers available nowadays from magic or puppet shows to bouncy castles or games and some who include a range of entertainment skills. It is also possible to bring in a party organiser . Use a large inflatable dinosaur or similar toy, place the children in a line or circle and pass the dinosaur along as the music plays. When it stops, the child holding the dinosaur is out, and so on.