Get created link from Crossuite
Go to [Settings] > [Diary] > [Connected calendars]. Click to copy a link.
To create a new link, follow the steps in the following article: (Connecting Crossuite calendar to an external calendar app)
Link to Google Calendar
Go to your Google Calendar and click [+] next to 'Other calendars'.
Now select [From URL]
Paste the copied link into the URL window and click [Add Calendar].
The calendar will now be synchronised with your personal Google Calendar.
The synchronisation happens randomly and not instantaneously. Crossuite has no control over this.