This is a blog post showing in Calendarize it! You can do this on a per calendar basis by adding an attribute to the Calendarize it! shortcode.
Remember you also need to choose the date that you want your Blog post to show up in the Calendar.
You can also choose to automatically show all custom post types in the Calendar by default. Go to Options > Custom Post Types and turn on this feature
In the same tab (Options > Custom Post Types) you can turn on the different Calendarize it! meta boxes for other custom post types.