Recently, calendar events entered on my iPhone stopped syncing to my Mac. Calendar syncing was enabled, and I even tried “Replacing Calendar Information on This iPhone” (next sync only).
Luckily, it ended up being pretty easy to fix:
- In this Apple article, follow the instructions under “For issues with syncing calendars” (I skipped the steps before that)
- Restart iTunes (I tried to sync without this step, but got a message like “sync session cannot be started”)
- In iTunes, go to the “Info” tab for your iPhone, and make sure calendar syncing is enabled
That should do it. Good luck!