Calendar Google Crawl Errors for missing schema.org fields

Google reports a bunch of crawl errors. As the schema.org type 'event' is used, markup for the following is mandatory:

Errors:
Missing field "location"
Missing field "startDate"

Warnings:
Missing field "image"
Missing field "performer"
Missing field "endDate"
 
It seems Google is punishing for this error. Traffic declines with the number of errors found. Have others found the same paralel?
 
It seems Google is punishing for this error. Traffic declines with the number of errors found. Have others found the same paralel?
My /events/ traffic is certainly down a bit since the change-over, this might explain it.
 
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