The Landing Master Calendar Block Full Width callout is used for highlighting three upcoming events on a full-width page.
Navigate to the post-content callouts. Choose "Landing Master Calendar Block Full Width" from the dropdown and click the "Add another Callout" button.
The following fields will appear.
Example of filled out fields.
Once you've finished adding in all the content you'd like into the fields scroll to the bottom of the edit window and click the bottom-left button labeled Save.