Calendar Location not working

I had the same problem. The cause was the calendar I was using as my default. I was using my work calendar which is backed by Exchange. It apparently doesn't support mapping/locations etc. I resolved it by changing my default calendar to an iCloud calendar. I tried leaving the default calendar as exchange and changing to another calendar when I wanted location services. This failed when I tried to save the event (couldn't change the privacy setting or some such).

If you would like to reset all of your location settings to the factory default, go to Settings > General > Reset and tap Reset Location & Privacy. When your location and privacy settings are reset, apps will stop using your location until you grant them permission.

In my case, the problem was a faulty address---I had the street address and the suite number. When I removed the suite number, the location immediately showed within the calendar app, as I had come to expect and rely on. So, it was operator error in my case. That said, maybe some day the app will be smart enough to ignore things like the suite number.

I have same issue with adding location search in calendar when creating new event.

When i try to search certain place(like clinic or shop whatever) in most of the case it shows me results in other city(like in case i live in Saint-Petersburg but results are shows for Moskow, Russia)

Although it is not allowed to "search manually" like in Maps exact location like street and building number if it not found automatically (only street address works available).

Already try most of the options from this thread but is is obvious that location service is buggy and not works as it should in different map engines and side apps.

I had this problem. I just changed the event status from Birthday to Event and now comes up with all locations when searching.