For some reason I'm getting 2 notifications for every 1 calendar event I enter.
I'm using Android 4.1.2 (CyanogenMod 10.0.0-grouper) on a Nexus 7.
Can someone please help me troubleshoot this issue?
CyanogenMod 10 includes an outdated Google Calendar app.
When I installed the updated one from the Play Store, I neglected to remove the system Calendar app.
Once I uninstalled the outdated system Calendar app, I only got 1 notification per event.
This might be irrelevant since I don't use CyanogenMod
I faced the same problem with HTC One (running Android Version 4.1.2) Calenders conflicting were the pre-installed one from HTC and the Google Calendar (which I prefer). I installed it from Google play, the solution might work also in your case too, but I'm not sure.
From the apps menu go to the App manager, and swipe sideways to the "All" tab there, scroll down to the calendar app you want to disable, click it and then click the Disable button. This did the trick for me. It's worth trying.