Hey @jaydeflix 
If what you specifically need is to see a full calendar of dates from across several boards while staying updated with the changes made to these items and dates, I would actually recommend using a Dashboard instead.
Specifically, I think The Calendar Widget would be very helpful in showing you all of the dates you need across these boards. You can also filter either the individual widget or dashboard as a whole to only showing items with specific statuses, people assigned, etc.
If you also want to physically see these items in a table-like view, you can do the same filtering as needed but this time on The Table Widget.
By using a dashboard, you can still show all of the items and dates you need in one spot without having to set up automations on several boards and make sure that mirror columns are set up properly to keep everything updated accordingly.
I hope this helps! Remember to mark as solved if this answers your question 
Cheers,
Jenna