Grant User Rights to multiple Resource Outlook 2010 Calendars

I need a fast way to grant rights (publishing editor, etc.) to 50+ calendars. I am an "owner" for all the calendars, however, I do not want to add the user(s) to each calendar one at a time, everytime I get a request.

I don't believe I have access to the "MAIN server", but I was hoping since I do have owner rights to the calendars (I am an admin), I could still somehow use power shell, or some other way?

PS
Our company uses Outlook 365 (cloud).
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