When I create an All Day Event (also happens with Meetings) when you uncheck the “Notify Me” box a dialogue pops up asking you to set the frequency, which is very annoying, but has been reported before.
I have now found (since upgrading to 8.0.2) I can go through the extra steps and uncheck Notify Me, but after I save and close and re-open the request the notification is turned back on. I can remove it, but as soon as I close it the notifcation reappears.
It seems you can’t actually turn notifications off…