Unfortunately, Google never added this capability to it's 'calendar' (classic version as of fall 2017); however, there is a Google Chrome plugin that partially accomplishes this. Event Merge for Google Calendar™ works when viewing via Google Chrome browser on desktop or laptop. It does not actually remove the event from each separate calendar. I recently moved calendar and contacts from one google account to another and experienced this issue. I had duplicates even though the old account was disabled, but removing the inactive account solved the issue. It could be a caching issue, but I was not waiting to figure it out. Tldr; Inactive accounts could also add to the 'Birthday' calendar. Dec 29, 2012 To delete a google calendar duplicate event from your calendar click the event you'd like to delete. Select delete from the pop up. The event will now be deleted from your calendar.

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Refresh your calendars

On your iPhone, iPad, or iPod touch with iOS 7 or later, open the Calendar app, then tap Calendars at the bottom of your screen to see your list of calendars. Swipe down on the list to refresh.
On your Mac, open Calendar and choose View > Refresh Calendars.
On your Windows PC, go to the Outlook toolbar and click the Refresh button in the iCloud section.

If you still see duplicate calendars, find your issue below to get help.

Remove duplicate calendars on your Mac

To hide or delete duplicate calendars in the Calendar app on your Mac, follow these steps.

Hide calendars on your Mac

Open Calendar. If you don't see a list of your calendars, click the Calendars button in the upper-left corner.
Find the section labeled On My Mac.
Compare the events in On My Mac to the events on your iCloud calendars.
If your calendars in iCloud show all of your events and the calendars on your Mac show only duplicates, you can hide the calendars on your Mac. To hide a calendar, deselect its box in the section called On My Mac.

Delete calendars on your Mac

If you choose to delete calendars on your Mac, delete only those in the On My Mac section. Don't delete calendars in any other section, like iCloud, Subscriptions, Other, or other calendar services.

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To delete calendars on your Mac, follow these steps:

Make a copy of your iCloud calendar data.
In the On My Mac section, click the calendar that you want to delete.
You can delete the calendar in two ways:
- Choose Edit > Delete.
- Right-click and select Delete.

Remove duplicate calendars on your Windows PC

To hide or delete duplicate calendars on your Windows PC, follow these steps.

Hide calendars on your Windows PC

Open Outlook and click Calendar. If you can't see your list of calendars, expand the pane: Click the right arrow button above the Navigation Pane button (Outlook 2007), Folders button (Outlook 2010), or All Folders button (Outlook 2013 and later).
From the left viewing pane, find the section labeled My Calendars. In Microsoft Outlook, you can find your local calendars in My Calendars, also called Outlook DATA file. By default, this box should be checked so you have access to your local calendar.
Compare your events in My Calendars to the events on your iCloud calendars.
If your calendars in iCloud show all of your events, and the calendars on your PC show only duplicates, hide the calendars on your PC. To hide a calendar, deselect the checkbox next to the calendar. If some events on your PC aren't in iCloud, try manually importing your events to iCloud. Open iCloud for Windows, deselect the “Mail, Contacts, Calendars, and Tasks” checkbox, and click Apply. Select the checkbox again and click Apply.

Delete local calendars on your Windows PC

Make a copy of your iCloud calendar data.
In My Calendars on your PC, right-click the calendar that you'd like to delete and choose Delete Calendar. Outlook won't let you delete the default Calendar, but you should be able to remove other calendars that you have permission to delete.

If you see duplicate Google calendars on your iPhone, iPad, or iPod touch

If you see duplicate Google calendar data in your iCloud Calendar, you can hide or delete your Google Calendar.

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Hide your Google Calendar

Open Calendar.
Tap Calendars at the bottom of the screen.
Find the section Gmail.
Tap All Gmail to hide all of your Gmail calendars. Or tap a specific Gmail calendar to hide it.

Remove your Google calendar

Go to Settings > Calendar > Accounts, tap Gmail, then turn off Calendars.

If you don’t see On My Mac calendars in macOS

To see the On My Mac section in the Calendar app in macOS, follow these steps:

Open Calendar.
Select any of the calendars under the section labeled Other, like Birthdays.
Right-click outside of the selected option, and select New Calendar. This creates a local calendar under the On My Mac section.

Manage holiday and birthday calendars

You can find calendars for holidays, birthdays, and other events found in apps in the section labeled Other in the calendar list. If you don't want to see these calendars, you can hide them.

Hide holiday or birthday calendars on your iOS device or Mac

To hide Holidays in the Calendar app on your iOS device:

Open the Calendars app.
Tap Calendars at the bottom of the screen.
Scroll down to the section labeled Other, and tap US Holidays or Birthdays to hide it.

To hide Holidays in the Calendar app on your Mac:

Open the Calendar app.
Go to the Calendar list on the left side of the window and find the section labeled Other.
Deselect US Holidays or Birthdays.

Manage duplicate birthdays on your iOS device

If you see multiple birthday events for a contact, check if you have more than one contact card for that specific person. Open the Contacts app, tap the Search field at the top, then enter the contact's name. If you see multiple results for the same contact, tap the contact, the tap edit to manage, delete, or consolidate their contact information.

Hello Dave,
Thanks for that info and choosing the Apple Support Communities. Based on what you stated, it seems you are having issues with duplicate events in the Calendar app on your new iPhone, but you don't see these duplicates in iCloud.com or on your Mac. First, use these steps to help resolve your issue:

Refresh the calendars on your iOS device or computer

On your iPhone, iPad, or iPod touch with iOS 7 or later, open the Calendar app, then tap the Calendars tab to see your list of calendars. Swipe down on the list to refresh.

Get help with duplicate iCloud calendars
If that doesn't help to resolve your issue with duplicate events on your iPhone, then follow these further

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