GCalToolkit software has the most advanced functions for mass edits and deletes.
Features:
-Remove any number of duplicate events in minutes
-Clean up failed Syncs/Imports with ease
-Delete events between specified dates
-Delete events by the date they were created in Google Calendar
-Delete events based on text/dates filters
-Undo any Changes you make (windows software only)
-Search/Replace text in the Title, Summary, Location fields (win only)
-Save/Continue an editing session
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