How to create an event post step by step

Click on Posts > Add New

Type in your event post title where you see big ‘Add Title’ in the middle (1), then click the + sign to add content block (2)
Select Image to add the event flier (3)

Click Upload to upload the image/flier from your computer or click Media Library to insert an already uploaded image/flier
You can type additional text if you click below the image you have just inserted.

Now click on Post on the top of the right pane (1), find and click Categories to unfold the list (2), and select Event (3)

Scroll down the big options list, find Featured Image; click to unfold Set featured image button and click;
from Media Library select the same image/flier you previously added as event post content 

Click Publish (twice) on the top right corner to publish your event post!