iPhone to Mac?
When I enter an event on my mac it shows up on my iPhone caledar. But not vice versa? Help?
iPhone 4, iOS 6
If you're using iCloud, this Apple doc might help ya out -> iCloud: Troubleshooting iCloud Calendar
You can also try to narrow down the problem a little by taking a look at your calendar on the iCloud site, to see if the events created on your iPhone are pushed to iCloud.
If you are syncing the calendar events when your syncing your iPhone via the cable and iTunes, try Resetting Warnings.