I recently flew from Arizona to Illinois, the appointments I had put in my calendar while I was in AZ all were adjusted to an hour alter when I returned to Chicago....how do I stop this from happening? Really messed up my schedule this week!
Basically, from what I gathered, if you enable this and set it to the time zone you want, then all events viewed or created in the calendar will go by that time zone instead of the time zone you're in. That way, you can set it to Illinois time to make your events always go by that time instead of Arizona.
I don't think there's anything you can do about the events you already created, though, other than fixing each of them.