Website Builder does not include a calendar feature, but you can use its HTML widget to display a third-party calendar instead. For example, you can embed a Google® Calendar on one of your website's pages, enabling visitors to see events and activities.
To complete these steps, you need to have a Google account.
A calendar won't appear on your Website unless it's public. Click Shared: Edit settings to make sure Make this calendar public is selected.
If you want to change the calendar's appearance, first click the Customize the color, size, and other options link just above the code window.