I've tried to look for possible custom fields associated with the event location, but it looks like that the calendar plugin uses a different method to store event data.
I've downloaded the plugin and tried to look through the source code, and it appears that they use a separate database to store the event location along with other data as well. I couldn't find however how to get this data correctly based on the event ID.
If I knew the code how to get this data, I would be able to suggest a proper solution as well.
If you want, you can ask the plugin developer on “how to get the event data based on the event ID”. If he can provide the proper code, I can help you make a filter function to add the needed details.Best,
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