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You will want to have the mom or parents to be create a gift registry, choose a venue and date. For more ideas; check out the Pinterest board. Don't forget to check out these cute piƱatas as well.

Food and drink ideas:
You may want to designate certain guests task such as hosting at their home, organizing games, taking photos and creating a play list. To cut costs consider venues such as parks or community centers if hosting at a home or air b&b is not an option.
Guests usually do not mind pot-luck style events when I have been to gatherings. If all else fails; places such as Olive Garden or breakfast spots usually offer affordable catering options.
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