Lots of the Calendar functionality comes from the Date module, so any time you update the Calendar module you should be sure you also update to the latest version of the Date module at the same time. Drupal Event Calendar is a highly customizable and easy-to-use module which allows you to organize your events into a nice-looking calendar that can be adjusted to the overall design of your website. Next you need to change the Show part, and change it from Content to Date iCal Entities.

The long tail of the iCalendar ecosystem. Drupal calendar ical One quick tip that might help you save a little bit of time is to enable the 'Calendar Popup' module only if you actually want it.