The calendar recurring events are set to clean up in four months (past). How are those links handled by default if one of those events are clicked on from a former email, social media post, etc.? Many of the 404 showing in Search Console are calendar events. Tips to manage this?
Currently I don’t believe we have any redirect set in place for these old events that get deleted after the clean up date. I’ll need to verify that with one of our developers though.
In regards to 404 showing in Search Console, are you referring to a Google Webmaster Tools type system here? If so, you might find this article helpful in explaining what may be happening there.