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The only way I can see of doing this would be via an SSRS report. It should be possible to create a calendar style view there and add the change records to it.
I needed this, also needed to be able to run reports for which areas were shut on a certain day, but was told it involved parsing the JSON file. It never occurred to me that printing out the calendars would not be available when they worked so hard to make a calendar style interface. Please join me in requesting it as a feature as well as direct reporting against those values i.e. Select all OUs closed on 2018-01-01