Duplicate calendar entry removal

This might help, it solved my problem:

https://discussions.apple.com/thread/3587948?answerId=17860052022#17860052022

In this situation, the person was asking how to remove duplicates from their iPad. I was having the same problem on my iPhone as well as my MacBook. The instructions worked anyway.

Go to settings on your device, iCloud, Calenders: slide to off. Delete all events when asked. Wait 1-2 seconds, then slide Calenders back on. Merge all events when asked. Then check the Calender app. If it does not work, go to Calender on you Mac, and refresh the Calender. Then repeat.

I had to do this procedure twice before the duplicates went away, but at least it worked. I don't understand what is going on; it's like the system gets clogged up and you have to clean it out. Hope that helps.

If there is a better method, someone let us know.

I'll give that a try. This is a very annoying bug in the new Mountain Lion program. When I type a new item into my calendar, it dopplegangers and triplegangers. Hmm. I thought new software was supposed to make life easier, not harder.