If they building is set up right in the FM database, all the wards/stakes should be using the same facility calendar - meaning that you can't schedule conflicting events. However, I don't know as it would allow you to see the details of the events - just that the facility is being used.
Keep in mind, that no one should be creating this shared location. It should be there automatically. Check with FM if it's not.
There used to be a write-up about how that worked, but it seems to be gone now.
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