I need to invite staff. I believe I could do this before update?
What update ?
If you have a 4S there was no update recently.
Your info specifies iOS 6.1.4 - but that was only for iPhone 5
My fault. iPhone 4S Version 6.1.3(10b329) I took time to look it up.
Try a reset. There have been no changes to Calendar. Hold the sleep/wake and home buttons together until you see the Apple logo and then release. After the phone restarts, see if it works.
I solved the problem. Callander in iCloud was turned off. It was my fault. iPad mini, iPhone and Mac now sync and working. Thanks for input.
Retrieving data ...