Create an activity such as an assignment and set a start and finish date. Make the dates some time this month. Add a calendar block to the course page. Check that events appear in the calendar. Disable the assignment activity "Site administration  ► Plugins  ► Activity modules  ► Manage activities" -> Click the eye icon. Go back to the course. The events related to your now disabled activity should no longer show up. Click the calendar block to go to full month view. You should still not be able to see the events. Click on the day (you may have to click on another day and then use the next and previous arrows to get to the next day) view and check that you still don't get any event information relating to the disabled activity. As a student, use the web service core_calendar_get_calendar_events() (Create a curl request or use the test webservice files) to get events for the month. Make sure that there is no events for the disabled activity. As a student, export the calendar and once again make sure that there are no events for the disabled activity. Enable the activity and run through step 4 - 7 and make sure that you now get the events for the activity. Run the following on all supported databases: vendor/bin/phpunit calendar/tests/lib_test.php