Every time we make a hotel reservation, and enter the location into Calendar, we subsequently get a "Location changed to ..." message in the inbox. In all cases, the location is identical to what is already in Calendar. We travel a lot, so clearing these useless messages gets annoying.
It's hard to exactly replicate the problem because those messages are program-generated by the hotel servers. But if I create an event and then change the location (or other detail) a new message is sent.
My conclusion is that there's nothing you can do, if the server sends the update because it wants to, whether any modification was made to your reservation or not, you cannot not receive it. I would discuss this issue with the reservation issuer, not with Apple.
You don't say how you enter the event in the first place in Calendar. What happens if you simply wait for the message from the hotel to fill Calendar for you?
Calendar automatically sees the event in my mail so I accept this notification. There are more topics with the same problem but no one has given the solution.
Calendar Inbox "Location changed to ..." Messages
