Edit All Calendar Events at Once With This Google Script
Editing individual events in Google Calendar is a snap, but changing all of the events? Quite difficult without some program like this bulk calendar edit script.
Created by Senior Mechanical Engineer Derek Antrican, the script can rename all events in a selected Google calendar, change their location or description, move the start time forward or backward, change the duration of events, or delete them all at the same time. go (be careful with this as it is irreversible).
This can come in handy if you want to move all of your regularly scheduled appointments an hour forward or backward, or if you’ve moved to a different haircut / massage / grocery destination.
Use the keyword filter to change only your favorite events, not all of them in your calendar. Here’s the script:
Bulk Edit Calendar Events | Google documents