For a start, you could try "cosplay". Which is short for "costume play". This would involve buying outfits of the characters, three of which I can suggest, could be Link, Zelda and Shriek. (You can probably get these off of ebay or even make them like most people)
This is all I have, but it seems good enough for a party. (Your girl has great taste in games!)
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Birthday Direct is a good site online with many ideas for supplies and for your next birthday party. Another good site is called birthday express and it offers themed supplies for a child's birthday.
The website www.MarthaStewart.com has a section with theme ideas for children's birthday parties. The suggestions include Tea Party, Miniature-themed, polka dots, animal-themed, Pirates and Princesses, Movie Stars, Season-themed, Western-themed, and Color-themed.
sombraros lots, tacos, nachos, Mexican music,
Here are my ideas: - A color theme - Hawaii themed - Sport themed - Music themed - Outdoor themed - An animal themed - Flower themed I'm going to camp too. Have fun!
safety themed party
A trike would work wonderful for a girl this age or a dollhouse themed playset.
A couple of ideas are a Barbecue Themed wedding or a Citrus (lemon-lemonade) wedding. You can also have a Garden Themed wedding.
Have it in an abandoned building!
You can find Halloween themed recipes from food bloggers that post their recipes and ideas and look for a Halloween themed post. They will make cute things like cake pops.
Jello.
Duct Tape Everything Even Her Mouth So She Will Shut Up