Copy items from Calendar list in each subsite to Calendar list in root site in SharePoint Online using CSOM PowerShell

Question

I am trying to copy all items from Calendar list in each sub-site to the Calendar list in root site.

Here are my thoughts. Is it possible to make a CSOM PowerShell script for this?

Answer 1

The structure seems to be fine and here is a sample script to copy list items between sharepoint lists： SharePoint Online: Copy List Item to Another List using PowerShell

And of course you can have a check on the OOB approach using Calendar Overlay. How to show a calendar from a sub-site on the home page