It happened to me too, and I found this:
http://support.apple.com/kb/TS3505
I followed these instructions and it seems to have worked. This is to be done on the iPad, not on your Mac.
Helene D., Sainte-Sophie, Quebec
--- In iPad@yahoogroups.com, "caralecosben" <caralecosben@...> wrote:
>
> Does anyone know why i am getting duplicate calendar entries after uploading ios 5 on my iphone? I'm sure it is related to cloud, but how do i stop the duplicates?
>
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