It can be time consuming to update multiple calendars. You can now setup custom flows using Microsoft Flow to copy and edit data between the two calendars.
In the example below, I create a Microsoft Flow to detect when a new Google Calendar item is added and then create a new item in a SharePoint calendar.
First of all, open Microsoft Flow.
Select “Create from blank” to open the flow editor
Search for the correct trigger by typing “Google” into the search box. You should see “Google Calendar – When an event is added to a calendar”. We will use this trigger to detect when a new item is added to the Google calendar.
When prompted, sign into your Google account and allow access to the calendar.
We are now going to add another step to the flow to add the items into our SharePoint calendar. Click “New Step” and then Add an action.
Search for “SharePoint – Create item”, add the URL and list name. This should load up all the calendar new item fields.
Click in each field and select the output from the previous step (the google calendar data). You may wish to populate the Title, Start Time, End Time, Location and Description.
Select “Create flow” when you are ready to publish the new task. It can take a few seconds for the task to run once the Google calendar item has been added. You can check the progress and status of the task from the Flow site.
There are other things to consider when setting this up such as all day events, recurrence, editing items and deleting items. However, you should be able to extend the logic in the flow to handle these data types. Below is a video guide going through the process.