Bookem allows you to use 'Add to calendar' options on public booking view. After your client makes a booking, they can add their booking to an external calendar like Google or Outlook.
1. When your client follows the link in their booking reminder/confirmation SMS or email, they will see the 'add to calendar button'.
2. Clicking this will open drop-down list of external calendars to choose from.
3. Select the calendar to link to
4. A pop-up window from the selected calendar will prompt you to confirm linking the booking to the calendar
That's it!