You find the calandar in a brown block 

If you click on the name of the month you will get a larger monthly summary

Monthly summary

Click on the individual events to possibly find more information.

At the bottom you will find links to export calendar events to another calendar or subscribe to Moodle from an external calendar.
If you have the Moodle app, you do not need to export your calendar, see the user guide for Moodle Mobile.

     Export calendar: Here you can choose what you want to include.

ICal: A quick file, without making any choice
Manage subscriptions: Download events from another calendar to Moodle