Overview

You have hundreds of duplicate calendar entries that need to be deleted. You are using Bonzai v2.2.1.

Solution

1. Option 1: Access the calendar list, sort by name, shift-click the duplicate entries, and delete the items.
2. Option 2: Create a script to run in Sharepoint Management Shell such as Sharepoint-online-find-and-delete-duplicate-list-items-using-powershell.html