If you want to post an event to the calendar you can click the

button at the top of the page and then click on the day you want to schedule the event, or click the

button at the bottom of the calendar page. Either way you will be presented with a screen to fill in details. Don't change the "Post In" pulldown option.
If you have already made a post in the "Event" section you would like added to the calendar you can go to that topic and click the

button at the bottom of the page.
