You should plan a party around the interests/hobbies of the child. There isn't one answer that will decide what you should do. The child would be old enough to offer his or her input and ideas and it can really help you. At this age kids are often interested in planning their own party. If you are stuck for theme ideas, game ideas, food ideas and any other party ideas you should check out the related link. It has alot of great tips and ideas, you are sure to find something!
fun children's birthday party
www.pingg.com
you can find fun halloween game ideas for kids at party city of party america. they have a ton of cool fun games that will keep kids entertained during the halloween party.
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Boomers Party Movie Theater Party Dance Party Knotts Scary Farm Party Pool Party (if you have a pool) Beach Party Bonfire Bowling Party Karaoke Party Color Me Mine Party Arcade Party Vegas Party Concert Party Board Game Party Dinner Party Sleep over or Slumber Party DJ Party
a game that you go to all of the regions
Monopoly or clue
maximum originality
cleopatra
gift
Try http://www.great-time-party-games.com/group-party-games.html for some great party game ideas.