Get an ‘Add to my Google Calendar link’
When you book a lesson completely, you will be able to see this ‘Thank You’ page. Click “Add to my Google Calendar' and ‘Save button’
Change notification preferences
You can change notification preferences for specific calendars you own.
In the top right, click Settings.
On the left, under "Settings for my calendars," click the calendar you want to change > Calendar settings.
Under "Event notifications" and "All-day event notifications”:
To edit your notifications: Choose if you want to receive a notification or an email. You can change how often you want to get alerts in advance.
To add another type of notification: Click Add notification.
To remove a notification: Click Remove notification.
Useful link: How to modify Google Calendar notifications