Creating a New Event
In your calendar click on the "New event" button in the upper right hand corner. Students will be able to create user events, but teachers can create course events. Title and describe the event, then set what date it will appear on. If this were an event with an end point, such a vacation or a class session, you could select the end point for the event as another calendar day or a set value of minutes. If this will be a frequent event you can set it to repeat every week, for a set number of weeks.
This event will appear in the right hand column of your main Moodle page for the course under "Upcoming Events".
Create a Repeating Event
After creating an event you may set it up to repeat every week by selecting "Repeat Weekly" and setting the number equal to the number of weeks in the course, including all holidays.