It was me whom believed it was not a Jevents Language string as my localised search on a joomla/jevents installation did not report it.
Seems I was searching the wrong installation which in fact did not not jevents in!
Doing the search correctly has shown, that it is called and what it is there for.
What is the menu item that you are creating? basically looking at the code you are reverted back if you are not the event creator so it appears that the menu item you have created might be designed for event creators?
Why do you believe Jevents has corrupted your site?
You might want to try running as authorised user mode and enable and adding the authorised users, see if that helps.
You can uninstall it as normal and run:viewtopic.php?f=17&t=10580