All items on a Moodle course with dates (e.g. due dates for assignments) appear automatically in the Moodle calendar for that course. Staff can also upload course and group events, such as for field trips and presentations. Each user will see a combined view of all their calendar entries within their My Home page. This shows all events across all the Moodle courses students and staff are enrolled on. Lectures and tutorials can either be added manually to the Moodle calendar, or imported via ical.
The Moodle calendar can be accessed by clicking on the month within the Calendar block, or clicking Go to calendar... / New event... at the bottom of the Upcoming events block.
This guide is in development. For now please see: https://docs.moodle.org/26/en/Using_Calendar